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Dexyfen Review - Does This Fat Burner Really Work? Are side effects and lack of availability deal breakers?

By Summer Banks on Sep 15, 2016
Dexyfen Review

Diet products either work or they don’t. Period. Let’s find out which one Dexyfen is. After taking an in-depth look at side effects, ingredients, clinical research, and customer service. Then, we summarized and condensed everything to give you the bottom line.


What is Dexyfen?

To begin with, Dexyfen is an appetite suppressant and metabolic stimulator so you eat less while burning more fat. Ingredients include caffeine, yohimbe bark, oryza sativa seed, menthe haplocalyx leaf, and zanthoxylym piperitum fruit. You are only to take one capsule daily, according to the product label.

Dexyfen is produced and marketed by Image Sports. You can find it for sale as “Dexy” on the official website, but the original is also available through some third-party retailers. We like that it uses caffeine to boost energy and metabolism, but read on…

Side Effects – “Be Careful!”

Our first concern is multiple reports of Dexyfen side effects. “Supplements high in stimulants can cause side effects for some users. This is especially the case for people who are sensitive to that type of ingredient,” said our Research Editor.

”I am healthy, but after taking this I felt…jittery [and] could not sit still,” said claimed one user.

”I had to stop taking this after two weeks because of the side effects,” stated another.

Some customers didn’t experience any side effects

“I lost 10 pounds in no time without side effects,” said one pleased dieter.

“This stuff gives me the energy I get through the day, and I don’t feel jittery,” said yet another.

Availability – “Where Did It Go?”

Image Sports made the product, but has since changed the name to Dexy. It is likely the old formula has been pulled from the market making it difficult to find.

One unhappy dieter exclaimed, ”I loved this stuff and can’t find it at GNC anymore.”

Others don’t mind that it’s not available anymore.

“I loved this stuff, but I am sure GNC replaced it with something just as good, if not better,” noted an optimistic customer.

Over the years, we’ve learned that all it takes is one small thing to stop customers from getting long-term success. If Dexyfen causes side effects and is hard to find, this can be an issue for dieters.

The Science – “Some Ingredients Are Proven”

Dexyfen contains many ingredients, but caffeine is shown to boost the metabolism. You can get it as a standalone ingredient in pill form, or naturally in coffee and tea at a fraction of the cost. There’s not a lot to say about the rest of the formula.

At DietSpotlight, we want to see science before we can suggest any product to our readers. We want to see safety, effectiveness, and good value before we provide a recommendation.

The Bottom Line – Does Dexyfen Work?

Should I race out for a bottle of Dexyfen? If you mange to find it, you may want to take several factors into consideration. Image Sports no longer sells it, so any product may be old or out of date. We also have reservations because of reports of side effects.

If you want to shed those extra pounds, why not try weight-loss supplement made with clinically tested ingredients known to help boost the metabolism. For even better results, combine it with a nutritionally balanced diet and regular exercise program.

Among the best products we’ve seen in 2016 is Leptigen. Made with a blend of four key ingredients all shown in clinical testing to help boost metabolism, fight appetite and increase energy, this may be what helps you reach your weight-loss goals. A deep look into customer feedback revealed no negative mentions of the product. But, we did find a number of reports of great results.

Plus, right now, everyone can get in on a Special Trial Offer, available directly from the manufacturer. This is the kind of thing we love to see.

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About the Author:

Summer Banks is an ISSA-Certified Fitness Nutrition Specialist and has reviewed over 2000 diet products. She has years of nursing training, experience as a manager responsible for 15 supplement brands, and completed coursework on Food and Nutrition from Stanford University. full bio.

How Does Dexyfen Compare?

Previous Dexyfen Review (Updated May 4, 2015):

What You Should Know

Dexyfen is a supplement produced and marketed by GNC, or General Nutrition Company. It is an appetite suppressant and metabolic stimulator so you will also burn more fat. If you are looking for a fat burner and appetite suppressant combination supplement to help you reach your weight loss goals, read this review to learn more about the product and how it works.

List of Ingredients

Dexyfen contains the following ingredients:
  • Caffeine (as caffeine anhydrous)
  • Pausinystalia yohimbe (bark)
  • Oryza sativa (seed)
  • Mentha haplocalyx (leaf)
  • Zanthoxylum piperitum (fruit)

Product Features

Dexyfen contains several different ingredients, but they are all natural. Caffeine anhydrous is a form of caffeine that has been dehydrated for a stronger concentration. Yohimbe bark is used as a sexual enhancer, but it is also a stimulant that can help increase the metabolism. Oryza sativa is a type of rice, rich in antioxidants that can help combat against disease, as well as healthy fatty acids that can help transport fat from the body. Mentha haplocalyx leaf is a member of the mint family with several medicinal uses, but in the case of this formula, it is used for its diuretic properties, to help flush excess water from the body. Zanthoxylum piperitum is a natural herb, traditionally used to treat stomach pain, but in the case of this supplement, is designed to help promote healthy digestion.

See Our Featured


  • Dexyfen is an all natural formula.
  • This product has several positive reviews from customers.


  • Dexyfen contains more than one stimulant, so those who are sensitive may want to avoid taking the product within several hours of bedtime. It can disrupt sleep cycles, cause headaches, jitters, and irritability.
  • Diuretics pull water from the body, which may lead to dehydration. Water weight loss is temporary and though it will produce results on the scale, will not be like fat loss.
  • This product is not recommended to use for more than 8 consecutive weeks without a break in between.
  • There are no free trials of this supplement.
  • This supplement is $57 for a monthly supply, which makes it expensive for a lot of people.


Dexyfen claims to be an appetite suppressant, but we do not see anything in the formula that acts an appetite suppressant. There are several different stimulants in the formula that will help with burning fat. However, without the balanced diet and regular exercise program, the supplement will not do much work. No supplement will do all the work for you. It is plausible you will see weight loss results with this product, but after a full 8 week cycle, you may not be able to keep the weight off while you are on your off cycle.

Dexyfen Questions & Answers:

We looked at all sorts of user responses and comments about Dexyfen, and summed up everything into this helpful FAQ.

What are the side effects of Dexyfen?

Possible Dexyfen side effects may include nausea, jitters, increased blood pressure, headache, sleep troubles, upset stomach, fast heartbeat and anxiety. This is according to some customer reviews we found posted on the web.

What are the ingredients in Dexyfen?

Dexyfen ingredients are yohimbe, Japanese pepper, mentha haplocalyx leaf, oryza sativa seed, niacin, caffeine and thiamin.

Does Dexyfen work?

First off, Dexyfen does contain stimulants such as caffeine and yohimbe. These components may help boost metabolism. The minerals in this supplement may assist with proper digestion and energy levels. Also, the oryza sativa seed could potentially help reduce appetite to some degree. However, there is no solid research to support this. Unfortunately the specific amounts of each ingredient used in this product are not disclosed.

How much does Dexyfen cost?

The retail price of Dexyfen is $69.99 per bottle (56 capsules).

How should I take Dexyfen?

The directions say to take one capsule each morning on an empty stomach. Never exceed one capsule per day. A bottle lasts for 56 days.

How do I contact Dexyfen customer service?

You can contact Image Sports, the parent company of Dexyfen, by calling 954-279-1782. This company is located in Fort Lauderdale, FL.

Can I take Dexyfen if I have a health condition?

To start, women who are pregnant or nursing a child should not take Dexyfen. Furthermore, people taking prescription drugs and those with medical conditions need to consult a doctor before using this product. Individuals under 18 should not take this supplement.

What do users like about Dexyfen?

Some users appreciate that Dexyfen is easy to find online via stores like Amazon. Others like that this weight-loss formula contains some minerals.

What do users not like about Dexyfen?

Some users do not like the side effects they experience with Dexyfen. Also, there are customers who have complained about to chest pains, blurred vision and dizziness.

Is Dexyfen suitable for women?

Yes, Dexyfen is for both women and men alike.

Can Dexyfen be used in the afternoon or evening?

No, Dexyfen should only be taken in the morning. This is due to the stimulants in this supplement.

Do you know of any special deals or discounts on Dexyfen?

Well, we did find Dexyfen on Amazon for a discounted rate of $33.98.

76 User Reviews About Dexyfen

Leave comments below
  • 1

    I tried this product today for the first time. My friend, Gloria, used to work at GNC and she had given me the bottle she had because she cant take them. I hadn’t eaten anything and she said it would help in my weight loss that I have been trying for months. It would also give me a lot of energy. She brought them to my store and said she would stop back on her way home. Well, I opened the bottle and they were purple, my favorite color, so I thought these are going to work for me. I have tried numerous kinds of diets, nothing seems to work. I have gained 40 lbs. and HATE it!!! It was about 9:00 am., by 9:10 I felt like I wanted to kill her!!!! I started to get really hot and my arms were itchy, my heart was beating really fast, my stomach was upset, I didn’t know what to think. So, I thought I would try eating something, a small bag of chips, now I felt like I could throw up, but I didn’t. I tried to relax and control my breathing, my arms were still itchy and red but if I didn’t think about it, didn’t seem to bother me as much. Needless to say, all my shelves were fully stocked and floors clean. It was about 11:30 and here comes my friend back. I said what the —- did you give me???? She said it was all normal to experience what I did and then we looked it up on google. Everyone is different, but I recommend each person to know the side effects before you start taking it. I don’t know if it will help me lose the weight I want to yet or not, but I am going to try it. I will update my review in 2 weeks or so to let everybody know. This was very helpful to read other peoples reaction to taking Dexyfen. Thank-you!


  • 2

    Will it show up on a drug test?


  • 3

    How is his recovery going? i believe im going through the same thing.


  • 4

    Can you take the diet pill after you eat?


    Your Name

    I eat before I take it and it works well for me. I’ve found that if I take it on an empty stomach I sometimes get some stomach pain.


  • 5

    After reading all of the reviews I’d decided to perform a “guinea pig” test on myself. This is what I found:

    If you’re experiencing swelling hands, this is more than likely because your blood is circulating more than usual. I get this sensation every time I start to run again after months of no exercise. After a few days of exercise, that sensation always goes away.

    From taking this pill and working out and taking this pill and doing nothing, what I saw was you are a LOT more amped and prone to the side effects than if you immediately go to the gym, go for a walk or run and stay active for the next few hours. Going to work isn’t enough.
    I don’t drink coffee nor do I take stimulants of any kind on a regular basis, so you can expect I would be sensitive to the side effects. I actually felt nothing more than a bit more energy than usual and a LOT of sweating. After running/walking over 3 miles, I sat in my back yard and did some light yoga. It felt like I was in the middle of a Bikram class, I was sweating so much. But it wasn’t jittery at all. It took me a while to cool down before I could take a shower, but the sensation wasn’t awful.
    I took the pill, as directed, on an empty stomach, drank plenty of water and then took the D.I.E.T. pill in the afternoon, also on an empty stomach.

    The idea is to be physically active after taking these pills. No pill will make you lose weight without some sort of activity. And again, it’s got to be activity. Not sitting behind a desk or simply meandering about. You need to get your circulation going more so the pill will do it’s job. Even after I took the pills without working out I felt gross. Once I worked out I felt amazing.

    As with any diet pills, you must eat right and work out. Even if a brisk walk. But sitting down watching tv isn’t the way to do it. And remember, swelling hands are normal, even when NOT taking anything. It happens all the time when you begin a regime of any kind. Trust me, once your body is used to the “more than normal” activity, the swelling will subside and you will feel it no more. The burning sensation won’t occur if you’re working out because you’re already hot and sweaty from the work out that you won’t feel the “burning”.

    Good luck to everyone and I hope you all attain your personal weight goals.


  • 6

    Thank you for this important review and most of all, the humour you found…


  • 7

    Im thinking of trying out but I’m diabetic, is it safe to this?


  • 8

    I started taking this May 14th and so far so good. I used to take oxi elite pro and that was amazing for me but they have taken it off the market. I went to GNC and the woman told me this was comparable she did say to eat a little something 45 min before u take the two pills in the am because it could upset your stomach. I was a little worried after reading some of the reviews but I figured I wont know until I try it for myself. I did experience the warm sensation but I was used to that from oxy elite pro. I also had really good energy throughout the day no jitters or shakes or rashes nothing negative at all. I took the afternoon pill and again gave me energy and usually that is the time I start getting a little tired. I am using this to get rid of the last 10 lbs i have lost 65 lbs over the past year thru diet and excersise I eat healthy and workout 5 to 6 times a week I just hit a plateau and wanted to try this to see if it would help me get over this plateau. I think everyone handles medications and supplements differently I love it so far and will continue to take it for the recommended 8 weeks.


  • 9

    Do you think it would be ok to take this supplement every other day?


  • 10

    I just started Dexy last month and so far so good. I tried another similar thermo-gen last year so I wasn’t concerned with the ‘rush’ when taking it. Dexy is a little less tame than the other brand, in my opinion, but everyone’s different. The energy is Amazing but I do run or walk a mile at least twice a week. Started Dec. 30 and im down 20 pounds after weighing myself today. (Feb. 17) I eat super light throughout the day(oatmeal, salads, granola bars)cause im not that hungry either. I like this formula, don’t add or takeaway from it.



    what about mentally and psychologically, how do you feel?

    Thank you


  • 11

    I’ve drank coffee since I was 5 so it doesn’t really effect me anymore so I didn’t feel any crazy jitters or horrible crashes. What did scare the living hell out of me was the burning sensation and the redness because I thought I was having a severe allergic reaction but I went running anyways and felt great afterwards. It did curve my appetite but I forced myself to eat a little because anorexia already slowed down my metabolism way too much and I don’t want to just gain weight after I stop taking it and let my metabolism slow down. So far so good though. Even though I accidentally took 2 of the D.I.E.T pills at the same time on accident :/! I’m anxious to see weight loss!



    How were your results?


  • 12

    I’m an athletic 19 year old, using Dexfen for the first time. As instructed, i took the thermogenic on an empty stomach, went for a run (due to that boost of energy) , and ate a small meal afterwards.. Only take the thermogenic BEFORE 2pm and I also have the DIET combo, which i take after eating a meal -earliest to take this pill is 6pm (instructed by GNC employee). I’m not used to taking caffeine or having high amounts of energy, so when i felt the energy come in, I got a bit nervous, and started to shake. I also felt a slight headache. Just stay calm and control your breathing. Last effect it had on me was a little burning sensation i felt in my chest- while running. Drink plenty of water and DON’T freak out when you start to feel side effects. When i started to freak out, i realized i started to get nauseous and when i calmed down, it went away. Sometimes it’s all in your head. Overall, I had a pretty good first time experience. Energy went away after 2-3 hours. I didn’t feel like crashing. Just be smart about using the pill, and use it right. DO RESEARCH. (i know i did, and i asked lots of questions at GNC)


  • 13
    K sprick

    The first day I used dexyfen my face turned really red and felt hot. I don’t get those anymore after taking it on an empty stomach with 24oz of water and working out 20 min after taking. I used to take oxyelite, so I was excited to find this and it is working just us good.
    I hope this will help others experiencing the red rash/ burning sensation.


  • 14

    I took this for the first time today. I found out OxyElite Pro was banned again and the GNC rep recommended these. I bought first and then read about it. I am a little concerned because I have a pre-existing seizure problem (not bad)but still something to consider. I did get some gnarly burning and turned red but it only lasted about 30 minutes. I knew it was the niacin so I wasn’t too alarmed. I feel pretty good, no upset stomach or anything. I’m used to caffeine so I don’t anticipate headaches. My lips are still a little tingly and it’s been about 2 hrs since I took it. I’m sure it will pass. I’ll post in about another week with a better update.


  • 15

    Today was my first day of taking Dexyfen and I have to say, I’ve had a pretty decent experience whilst on this pill. I took the stimulant AND the D.I.E.T. pill this morning, and waited 30 minutes to make a protein shake. I wasn’t nauseous, but was extremely energized and literally could NOT stand still. Which was good, because over the past few weeks I’ve been quite tired due to laziness (oopsies) I didn’t have a crazy, scary reaction to the niacin in the product, as many of you might’ve. And that was my biggest fear, after reading lots of negative reviews particularly aimed at the niacin in the pill. I will say that if I did have a random itch somewhere, and I’d scratch it; wherever I scratched burned a little bit. But nothing turned hivey, swollen, or red on my body. The trick on these pills, as well as any other diet pill, is to DRINK LOTS OF WATER. Stay so hydrated that you’re going pee at least 10 times a day. Or maybe less. Maybe even more. Idk. Drink, drink, drink. Water not only helps while on a diet in a general; but it’s also crucial for your kidneys, since they are workin’ overtime while on these pills. Other than that, good luck all & remember to STAY HYDRATED.


  • 16

    I have taken a few different types of diet pills, fat burners, etc… over the past few years and have never had anything happen as bad as what Dexyfen did. This is by far the worst. I took 1 pill as directed and was getting ready to go for a run, but within 30 minutes of taking it I had to call the paramedics because I felt like I was going to pass out. I was as red as a tomato and my skin was so swollen that I could barely move my face, arms, and hands. It took over 6 hours for me to feel well enough to get up and move around. This was a very scary experience.


  • 17

    My first time taking dexyfen made me feel like most of you. But after a while I felt a little better. The only thing I really hate about this product is the burning feeling. But I’ve only taken four pills and I’ve lost 10 pounds in two weeks, which is good because I have been trying to lose weight for a while now. I have not exercised, I just drink plenty of water. I do not eat much because it curves my appetite.


  • 18

    how soon can you see results??


  • 19

    my first day taking it i took it on an empty stomach as recommended then went to the gym i did my workout by the time i go back home i was throwing up but i went ahead and drank my protein shake and that made me feel alittle bit better i recommend eating something before taking this if you are even the least bit sensitive to caffeine and it did make me red and itchy but it only lasted about ten mins im going to try it again tomorrow but this time eat first


  • 20
    Your Name

    Its my first day taking it I can definitely tell its suppressed my appetite, but it did make my skin feel like it was burning and that scared me and made me want to stop taking it, but the feeling did eventually pass after about 20 minutes. I dont know about weight loss yet but I dont think I’m going to stop taking it yet.


  • 21

    I absoluty hate this pill. I feel sick all day and feel like I’m gonna pass out. Will never take these again. I tried taking these 2 different times and still feel the same way


  • 22

    Great product!! From 202lbs to 162lbs…no exercise and no freaking diet…I LOVE FOOD.. It does make me eat less but I drink alot more water


  • 23

    its my second day taking the pill, i havent had any bad side effects, ive had more energy than i had before, i use it at work, my work is my workout which pretty much lasts all day, its given me that extra boost i need, it does make you sweat, no headaches, you just have to drink plenty of water, and im so far doing good, i recommend. ill post next week again to see how i am then



    These pills fucked me up I drunk a bottle of water when I took it its my second day and I threw up all the water that’s not suppose to happen is it ?



    I didn’t have that reaction, only headaches the first two days, I drink plenty of water, but no nausea


  • 24

    started taking this pill 4days ago. the first day i felt my heart rate go up a bit and had a surge of energy but had a energy crash in the middle of the afternoon and just felt exhausted. the last few days however, i havent felt any effects from the pill, and if anything i feel more hungry with no extra energy whatsoever. im not impressed with this pill at all so far. planning on making the switch to super HD as it seems to have better reviews



    I just took the pill two hours ago made me feel like the human torch from fantastic 4…lol..I’m going to continue taking the product. I tried Super Hd to see what all the hype was about but ended up being disappointed do to the fact it didn’t do nothing for me no energy or anything..i got a better rush from a 12oz cup of coffee than super hd..


  • 25

    What colors are the capsules?


    Korey MacDonald



  • 26

    Today was my first and last day taking this pill!!!! As soon as I took it this morning, on an empty stomach, I felt an energy rush. Half hour later the energy got even more intense and with a bit of jitters. Two hours into it…the symptoms were uncontrollable I was vomiting, diarrhea, headache I was completely shaking I couldn’t control it! I ended up going home from work… It is now 11 hours later and I feel numb and a headache. Worst pill ever!!! Do not recommend it. Do it the natural way watch what you eat and excersice… Horrible I feel like crap!!



    I’m pretty sure you should take this when you are about to workout. Why would you take it and go to work? Do you work at a job where you just sit down all day? That could be a reason you didn’t feel well…



    Agreed. If you dont plan on exercising soon after taking dexyfen you should not take it at all. Especially not before you go to work. Thats just dumb. I started taking this a month ago before I go to the gym and have loved the energy surge I get while working out. I admit im not crazy about the crash that inevitably follows when ever you take high doses of caffine but I have noticed a signifigant physical difference and it has really helped me push myself harder at the gym. I cant say its for everyone but so far I am happy with the results.



    the first few days i was on this i really didnt feel hungry much during the day but after i eat supper it wasnt long after that i was in the kitchen eating again like a bad habit.Seems it doesnt work as good good after it gets in your system good


  • 27

    I have been taking it first thing at 4am then breakfast. At first, a flush of heat, now I welcome it, because it makes me think it’s working. no jitters, energy for work which I like. I’ve only lost 5 lbs but I haven’t been exercising



    How long have you been taking it?


  • 28

    I tried this combo this morning for the first time. I took the pills on an empty stomach as directed with lots of water and ate a small meal after. I felt the energy come. on slowly but by the time I got to work I thought I was going to die. I had too much uncomfortable and intense energy that made me nauseous. I couldn’t see straight and felt like I was on powerful speed. I went to the bathroom and forced myself to vomit. I had to leave work because I was so nauseous and have been in bed all afternoon. my stomach is turned upside down and I feel like I’ve got the worst hangover. I’m so mad at myself for taking these pills and doing this to my body. I am taking them back as soon as I can walk again. OMG what a scary experience! I do not recommend to my worst enemy!


  • 29

    Been taking this for just over two weeks. I’ve been running for 8 months. 6 days of the week I get up early and run 2-3 miles every morning…in the past just running a few days of week would make me drop weight quickly but I guess in my late thirties it isn’t working for me that easily anymore. So two months ago I bought one of those sweat band or belts to wear and added a few sets of push ups and sit ups after the run when my heart slowed down a bit…still didn’t make me lose..so I went to GNC and told them my issue being I’ve been in the Army for 19 years, don’t really eat much for breakfast or lunch, exercise and can’t lose weight. The guy working there was ex army (so yeah I trusted him a bit more) and recomended two products but told me this was as good as the more expensive one and I only had to take one pill a day opposed to two. So starting the next I woke up and took one right off the bat..about ten minutes later I went running…he told me I was going to sweat a lot more..he wasn’t kidding. I am avoiding the scale thing until my next weigh in at my unit but I can tell you that my stomach is looking noticeable better already. The only side effects I had were the first few days I felt like I was overheating (and it did scare me for a moment or two the first day) but since then the only effect I can say is I definitely sweat more during my runs but I figure this is a good thing. My only worry right now after reading the above is if it is only taking away water weight and the whole needing to take a break after 8 weeks.


  • 30

    The doses of niacin and caffeine in this product made me leery about taking with just water on an empty stomach. If you aren’t a caffeine junkie you might want to at least have a fruit first. I take it first thing in the morning with a protein shake. As a nurse working 12-13 hour shifts sometimes I get to drink water sometimes I don’t, the days that I don’t drink as much water I feel more symptomatic like my stomach is eating itself literally. I haven’t been taking it consistently but will complete the bottle and give a thorough review when I do.


  • 31

    This is not a miracle diet pill nor anything over counter can be. If it was this country wouldn’t be full of fat people. With that said I am trying to shave the last 8-10 pounds off and need a supplement to get me there. I workout 6 times a week with a combo of cardio and weightlifting. I know one bottle isn’t going to get me there but this so far has given a bit of a boost of energy. I take it at 5am in the morning before a run, no coffee during the day and again at 1:30pm. Yes, twice a day! However I cut out redbull and other energy drinks laced with sugar, caffeine and carbs and within 3 weeks have lost two pounds. I have always drank coffee and energy drinks so cutting those and replacing was pretty easy for me. I have had no side effects other than increased energy. I also take a cutting agent every other week to keep the water retention down as the ingredients in this have the potential to make you retain water. Other than that I will say it again, if you are looking for a miracle weight loss pill this or anything on the market isn’t for you. See a doctor and consider gastric bypass if you are that overweight. Good luck to all those properly using this!



    what ingredients make u retain water in this product??


  • 32

    Really you must be diabetic!


  • 33

    I was taking this product for about a week and had no issues. The I got sick (not related to the pill) after about a week and a half break I started again and jumped right back to the gym. My heart was pounding, I got light headed and felt like I was going to vomit.


  • 34

    can i take dexyfen with a prework out statements



    Yes, I do. I work out at night though. I take Dexyfen in the AM and preworkout around 6pm.


  • 35

    Ummm why are you giving this to your child? it clearly says no one under 18yrs old????



    Where does it say that her son is a child or under 18?


  • 36

    I have taken this product for just about a year now. I don’t take it regularly and I also experienced the red skin the first time taking it. I don’t take it on a completely empty stomach. Usually eat a small amount and wait 30 mins to take. Energy lasts about 10 hours. I work nights and it keeps me up till 7am when I take at 7pm. I like this product.


  • 37

    I have been taking it for a week now. I see results. I also work out an run! Yes it turn my skin red and made me hot on the first day and fifth day. It is a pro thermogenic. So peoole can take them some cant! I would recommend this to everyone one I know.


  • 38

    I started taking the Dexyfen/DIET combo today. No jitters, headaches, rash, etc. Felt very energetic and overly happy. Could not stay seated at work. Kept walking to talk to people instead of IM’ing or emailing since I had so much energy so I think that added movement will aid with my weight loss plan in combination with running on my treadmill every day and a healthy diet. Took my pill on an empty stomach and 8oz glass of water but followed it right away with an 8oz protein shake recommended by the GNC rep. No sick stomach feelings. When lunch came around I ate my healthy home packed lunch even though I was not hungry. Going home to make a healthy dinner even though I’m not hungry. So far I’m liking it. Just waiting to see if I am too hyped up to sleep. If not then I will be pleased…..at from day 1. Will see what the weight loss looks like in a week. Going to give it an honest 30 days and then make a determination if this is going to work for my long term goal or if I need to try something different.


  • 39
    delana bluford

    Dexyfen is a good product in my opinion if your trying to lose weight…for me the pros give me energy to work out, it completely takes away my appetite up to 3 hrs,it works similar to a mild laxative,and it puts me in a good mood…the cons are when u first take them your stomach may get upset.but u must drink alot of water threw i..they made my stomach upset for like 2 minutes when it started breakung down in my stomach…but it is a strong product and your body has to get used to it…after the 1st day it didnt happen anymore..it is more on the pricey side..thats just how it was for me..its not for everyone but nothing is for everyone….one last thing i got them from gnc in the mall


  • 40

    Great product. I eliminated all pre workout supplements and started using the Dexyfen + D.I.E.T combo, that’s it. I have been using this for two weeks and have lost all of 10 pounds of pure body fat. Muscle definition i’ve never had. Running 10k a day vs my old 5k. I would recommend this product to anyone looking for a good product to use with a combined healthy diet and workout regime.



    How long have you been on those 2 products? How has it been working for you? I just received my Dexyfen/ D.I.E.T. order, and was planning on starting tomorrow….



    So do you use bith of them or are you just using the D.I.E.T pill now and not the pre. workout one? I tryied the Pro.Thermogenic last week and it felt like my throat was burning. I’m scared to try it again. I have both!


    Your Name

    The niacin is what make you feel like your burning. Keep taking it and your body will stop feeling like that in a couple of days


  • 41

    The reason you people are getting a “rash” is because of the niacin that is one of the main ingredients. Niacin flushes bad toxins out of you and that’s what the red skin comes from. Its not a bad thing your body will get used to this product. Its not a allergic reaction



    The reaction I had was DEFINITELY an allergic reaction and NOT toxins being flushed out of my system! Not only did my skin turn bright red and felt like I was on fire, but my face complete swelled up!


  • 42

    I had the same reaction but it went away after two days of use.


  • 43

    Also, make sure you take this on an empty stomach as it suggests. THEN EAT YOUR BREAKFAST (or pre-workout meal) OR YOU WILL GET SICK. Would be the same if you tried to drink a pot of coffee and not eat anything at all for a while. Just because it says to take on an empty stomach doesn’t mean don’t eat at all. Again, common sense. This is not a miracle pill…those don’t exist. This will aid and speed up the fat loss if you work out regularly (3 days a week minimum), stay hydrated, and eat healthy (no or very minimal processed/white foods). If you don’t do the research on Thermogenics, you will make yourself sick and they will not work. You should always do research before taking a “fat burning” supplement. Check the ingredients to be sure there is not something in there you are allergic to. Doing research beforehand can save you time, money and frustration. Just because a few people say they had a bad allergic reaction to it doesn’t mean you will. Most don’t even acknowledge that they are allergic to one or more of the ingredients. They just mention that they broke out in a rash. Also, in regards to body temp rising, that is what Thermogenic supplements do to aid in the fat burning. If your body is cold, it won’t burn. The feelings “go away” or you get used to them. Don’t take it for 1 or 2 days and then write them off or flush them. Everyone is different and your body does need time to adjust. If you take them daily, you should adjust in about 3 days. Just don’t start your workout routine until you have adjusted or you might hurt yourself.



    I’ve been taking these pills on and off for a while, the only time I’ve gotten sick on them was when I did as directed and took a pill before eating. Now I eat a meal and wait an hour or two and then take the pill… Sometimes I do feel nauseous taking them but it’s never bad enough to keep me from eating a regular meal. I’ve noticed I do burn fat easier taking these pills, however sometimes they do make me irritable! I think these pills are good as long as you aren’t allergic to them or have any health problems!


  • 44

    It’s 0426 am and I am at work.. My day starts at 0250am and that’s when I chose to take my first one. I started the bottle to very apprehensive.. So far I have had no bad side effects! I used to use oxyelite and my reaction to that was far worse. I’ll continue using and fill you all in on my results on a weekly basis!


  • 45

    Within 10 minutes of taking just 1 pill, my hands started to itch and turn red, next thing you know, my face is red like a bad sunburn. Needless to say, I had to take some Benadryl and flush the rest down the toilet. NO GOOD! DO NOT TAKE THESE!


  • 46

    I have taken this pill a few times as directed on an empty stomach in the mornings and each time has made me feel like passing out. My body has felt as if I were having hot flashes, dizzy, weak, as well an feeling my stomach irritable (not each time). I just thought that my body was not use to it and had continued to take it, each time I felt just about the same today being the worse out of all of them. I just think this should be tried out first prior to actually purchasing a full bottle since I believe that each person might have a different experience from it. For me, obviously did more harm then good.


  • 47

    Tried a free trial, it was okay. I’d recommend it to someone. As far as the appetite suppression goes…it made me feel a little nauseous, so that suppressed my appetite…but I’m not sure that it’s supposed to work that way.


  • 48

    I have never tried Dexefen and I came to this site to get input from others. My biggest concerns were the two components of disulfide(a derivative of Sulfur in the form of Thiamin), and caffeine. I work in the medical profession as an LPN, I commonly see Thiamine in the form of mononitrate as oppose to disulfide which may produce sensitivity in persons allergic to sulfa drugs. I am allergic to sulfa drugs. I drink maybe a cup of coffee in the mornings which contains about 200mg of caffeine. I am really nervous about pushing my luck with 550mg. My concern would be if you don’t have a medicine on hand to counteract the negative effects of that much caffeine, you probably should not take it. I am glad that the makers did emphasize the content of caffeine. I did find the answers that I sought and after reading the reactions that some of you experienced, I will not attempt this supplement. Thanks for the information.


  • 49

    I have been using dexy now for he last 2 months..yes it kills my appetite to the point i sometimes have to remember to eat..I don’t experience any “jitters” or other side effects..I do give myself a day off one a week from it..overall i Like the product and it does a fine job..


  • 50

    Took my first pill this morning, made me break out in a red rash on arms and face feels as if it is going away, is this common reaction



    I have been taking this product for over two months with no break in between, I have definetly lost weight, I work out 5 days a week , I’m a full time student , and I’m on a slightly strict diet.. I just purchased my third bottle of dexyfen, does anybody think I should stop or keep going?



    I would take a break if I were you. Dexyfen is something you use for temorarily speeding up results. Then its up to you to retain the results you gained from it. Taking a thermogenic for too long can and will begin to cause damage to your body. While it is helping you to burn fat youbare also losing lot of crucial nutrients the body needs. Doing this for a short time is not a big deal. The body recovers. But taking it on a what seems like a permanent level, you will start to cause serious damage. I would cool it with the dexyden for a while, keep a regular exercise regiment and make sure your body is grtting the vitamins and nutrients it needs.



    This product does contain Thiamin disulfide which is a derrivative of Sulfur. If you are allergic to sulfa drugs, you may have a sensitivity to Dexyfen. This could be responsible for the hives that you experienced after taking it.



    It’s the Niacin, it tells you right on the bottle you may turn red, feel tingly and get hot flashes. It’s temporary and should go away after 10 minutes or so.


  • 51

    Run. This product makes jitters look like child’s play, it feels like your heart is about to explode. I am a registered nurse and do not believe this virtually intense increase of BP and heart rate is healthy in any way for your cardiovascular system in any way or form. Bad idea period!


  • 52

    This product is terrifying and I warn ANYONE against using it. I have used other products in the past with high amounts of caffiene and never had any kind of issues as far as sensetivity goes but this product made me, and athletic 20 year old, feel like i was having a heart attack. I spent two hours on the floor in the fetal position and another 30 minutes vommiting after following the product directions to take one capsule on an EMPTY stomach in the morning. I felt ill ALL day afterwards. I can say this much for the product after all the forced vomitting i certainly looked thinner afterwards. I have always had an iron stomach to caffine drinking sometimes six cups of coffee a day. THIS PRODUCT IS AWFUL. NATURAL INGREDIENTS DOES NOT MEAN ITS GOOD FOR YOU PLEASE STAY AWAY


  • 53
    Heriberto Lausell Jr

    Hello, I was wondering, what product would be really good at helping me get rid of my body fat. I feel that for as hard as im working I cant seem to go below my lowest which has been 12.5%. Please email me at heri.lausell.jr@gmail.com, thank you
    I am very active, i take spinning classses 5-6 times a week, and an hour of weight training after that. Please help me…I need some professional advice..


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