Updated: 05/17/2016 - Website operated by Leptigen

Stacker 3 Review - Does This Fat Burner Work? Are side effects and ineffectiveness deal breakers?

Editor's Review: 3.5 / 5.0
Stacker 3 Review

97% of dieters just want a product that’s effective. Yeah, we don’t understand the remaining 3%, either. For Stacker 3, we dug deep into the ingredients, side effects, scientific research and quality of customer service. We dissected hundreds of consumer comments and reviews. We then refined and summarized to give you the info you need.

EDITOR'S TIP: Substitute Stacker 3 with a proven fat burner such as Leptigen for better results.

What You Need to Know

To start, Stacker 3 ingredients include green tea, taurine, chromium, garcinia cambogia extract, white willow bark, chitosan and caffeine. The recommended dose is one capsule, three times per day with the results being, increased energy levels and weight-loss, according to product claims. The small size of the pill makes it easy to take on the go.

The product was introduced by NVE Pharmaceuticals Inc in 2003. It uses some natural ingredients, a good decision. You can purchase the supplement at your local retail store or on the web. We do like that the cost is reasonable, but read on…

Side Effects – “Out of Body Experience?”

The first concern regarding the Stacker 3 side effects is stomach pains. “When you take thermogenic supplements, you will notice changes like increased energy,” said our Research Editor. “But, dieters don’t expect adverse reactions when taking the pills.”

“I used stacker 3 xplc to improve my energy at work. I thought everything was ok at first but after a year of one pill a day it affected my kidneys. No stars only pain and regret,” commented a dieter.

“I took these once a day for five days with meals. On the fifth day I started experiencing serious side effects like dizziness, numbness in my fingers, and rapid heartbeat,” stated a user.

FDA Warnings – “A Major Concern”

On several occasions, NVE Pharmaceuticals Inc. has been contacted by the FDA due to mislabeling supplements. In April of 2004, the company received a letter warning of undisclosed ephedra in products. In September of 2012, the business received additional correspondence highlighting formulas with claims that were misleading.

Ineffectiveness – “Doesn’t Work?”

After researching consumer comments on the web, the consensus is that the supplement is ineffective. The majority of the reviews state customers take the product for months with no results. “I started this 1 month ago, using it as directed with normal diet & regular exercise, & I’ve gained 8 pounds!,” states a consumer.

“When I was taking it I didn’t lose any weight, I actually started gaining it!,” said a dieter.

“I first used Stacker 3 for weight loss, and I did not notice any weight loss,” claims another.

According to our research, if there is one issue, like ineffectiveness, chances of long-term success could be reduced. If Stacker 3 doesn’t produce results, we have concerns.

The Science – “Valid?”

Considering Stacker 3 doesn’t have an official website, there is limited information relating to the scientific research supporting weight-loss claims. We even checked the corporate site and the company doesn’t provide proof of effectiveness. For us at DietSpotlight, having published clinical data backing information is critical. If there’s no science, what’s to keep the dieter around?

The Bottom Line – Does Stacker 3 Work?

So, what happened at the end of our review? After taking a comprehensive look at Stacker 3, we’ve come to a conclusion. The company offers some positives such as the longevity in the industry and the inclusion of a few natural ingredients, but we have reservations about it because of the lack of published clinical research supporting weight-loss claims. We’re also concerned about the FDA rulings against NVE Pharmaceuticals and the number of complaints found in forums.

If you’d like to transform your body, we recommend going with a supplement that contains ingredients supported by published clinical studies with no reported side effects. It is important for the company to be legitimate and professional.

Among the best products we’ve seen in 2016 is one called Leptigen. The formula contains a four-ingredient, proprietary blend, shown in published scientific research to help enhance metabolism and spark fat loss. On the web, there are no comments about adverse side effects, but consumers are noticing amazing results.

Also, the makers of Leptigen are offering a Special Trial Offer. A good choice and a sign of confidence.

Learn More About Leptigen »
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How Does Stacker 3 Compare?

Previous Stacker 3 Review (Updated August 5, 2014):

What You Should Know

Click Here To See Our Highest Rated Review

Stacker 3 is a dietary supplement that is marketed toward men and women who desire assistance with weight loss. This supplement is manufactured by NVE Pharmaceuticals Inc. and sells in common drugstores, supermarkets and nutritional stores. Stacker 3 claims to burn away unwanted fat and boost energy levels. It sells in the form of a capsule and is directed to be taken daily with water. There are no customer testimonials for Stacker 3 offered on the official website. There are no free trial samples of Stacker 3 available. There doesn't appear to be a 100% money-back/satisfaction guarantee posted on the website for Stacker 3. The primary active ingredient offered in Stacker 3 supplements is Chitosan, which metabolizes fat. Similar to many other weight loss drugs, Stacker 3 is intended to be taken in conjunction with a healthy diet plan and regular exercise. No one under the age of 18 years old should consider taking Stacker 3 supplements. This dietary drug is not available via the official website. The website does not claim that Stacker 3 suppresses appetite. A full product ingredient list is not found on the website. NVE Pharmaceuticals Inc. additionally manufactures supplements like Stacker 2, 7-Phenyl Stack, Yellow Hornet and Swarm Energy.

List of Ingredients

Not available on the official website.

Product Features

Stacker 3 is a weight loss supplement that is claimed to help women and men reduce body fat. This dietary drug comes in capsule form and aims to increase energy as well. The key active ingredient found in Stacker 3 is Chitosan, which is a marine animal extract. Although this weight reduction product does not sell via the official website, it can be acquired in drugstores, supermarkets and nutritional stores. There doesn't appear to be any real clinical evidence provided on the official website to support the claimed effectiveness of Stacker 3 supplements. Warnings for this product are not offered on the website.

See Our Featured


  • Stacker 3 comes in an easy-to-manage capsule form.
  • Stacker 3 can be easily purchased in most common supermarkets and drugstores.
  • Stacker 3 is suitable for both women and men, but not for individuals under the age of 18.


  • A full product ingredient list for Stacker 3 is absent from the official website.
  • There are no customer testimonials provided on the official website for Stacker 3 supplements.
  • There isn't any clinical evidence presented on the official website to support the overall effectiveness of Stacker 3 capsules.
  • Stacker 3 doesn't appear to be offered with a 100% money-back guarantee.
  • Some ingredients found in Stacker 3 may not be suitable for some individuals.
  • No free trial samples of Stacker 3 are offered via the official website.


When all is said and done, Stacker 3 is presented like many weight loss supplements. While it's claimed to boost energy levels and burn away fat, there is no clinical evidence to support this on the official website. Furthermore, it would be nice to see some customer testimonials, a money-back guarantee, a full product ingredient list and free trial samples of Stacker 3 offered on the official website. When a manufacturer goes to the trouble of supporting their products this way, it shows that they really believe in what's being sold. It's probably prudent to consult your physician prior to taking Stacker 3 supplements.

Stacker 3 Questions & Answers:

We sorted through hundreds of customer reviews as well as the official Stacker 3 website to find the valuable information you’re looking for to create this helpful FAQ.

What are the side effects of Stacker 3?

Stacker 3 side effects may include nausea, jitters/shakes, and weakness.

What are the ingredients in Stacker 3?

Stacker 3 ingredients are kola nut, cactus extract, white willow bark, grapefruit extract, chitosan, caffeine, green tea, guarana, and garcinia. Other ingredients include gelatin, dextrose, stearic acid, magnesium stearate, titanium dioxide, Red 3, Blue 1, Red 40 and Yellow 5.

Does Stacker 3 Work?

Stacker 3 has helped some people lose weight, but there are many others who didn’t get any results. Chitosan has been studied for cholesterol management and weight-loss. The studies showed no significant effects after using the supplement for four weeks. Other ingredients in this formula have not been studied.

You may want to consider substituting Stacker 3 for a product able to provide clinically proven ingredients, such as Leptigen.

How much does Stacker 3 cost?

Stacker 3 is available for $16.49 a bottle with free shipping at Amazon. The list price is $31.99 so the price could change at any time. Each bottle contains 100-capsules..

How should I take Stacker 3?

Take one capsule after every meal, but do not exceed three capsules in a day. Bear in mind that the caffeine in this formula can affect sleep, so it may be wise to avoid taking it within six hours of bedtime, if you are sensitive to caffeine.

Can I take Stacker 3 if I have a health condition?

If you are suffering from any health condition, or using prescription medication, talk to your doctor to see if you are healthy enough for this product. Do not take if you are pregnant, nursing, or under the age of 18.

What do users like about Stacker 3?

Many users liked how easy it was to take, and that the formula is ephedra free.

What do users NOT like about Stacker 3?

Some users found the side effects bothersome. Others complained about the lack of an official website, concerns over past run-ins with the FDAand ineffectiveness.

Can I use Stacker 3 if I am allergic to shellfish?

No, the chitosan is made from the shells of shellfish and could cause an allergic reaction. Stacker 2 offers the same basic formula without the chitosan fat blocker..


How do I contact the Stacker 3 customer service department?

Without an official website for this product, all we could find is the official website for NVE, which doesn’t advertise their products – just about how they can make supplements for you. You can call 1-973-786-7868 or email info@nveusa.com.

Do you know of any special deals or discounts on Stacker 3?

As of the time of this writing, we are unable to locate any sort of special deals or discounts on this product. Recently, we’ve found many of our readers have been taking advantage of Leptigen’s Special Trial Offer, which is just the cost of shipping and handling. Click here to give it a shot.

34 User Reviews About Stacker 3

Leave comments below
  • 1

    I took some yesterday and got real bad stomach pains. I work maintenance so I’m very physically active all day and needed a boost. I’m going to try them again today to see if maybe I just didn’t eat enough before I took them. But so far it’s terrible. I didn’t even get the energy I wanted from it.


  • 2

    I’m trying to lose weight so I’m giving slacker3 a try I do have one question will it mess with birth control I just started the depo shot


    Stephen (Editor)

    Please ask your doctor to look over the formula for you. What may be most affected with taking a diet supplement is possible reduction of your birth control’s efficacy. Green tea and Glucomanan, for example, may reduce the absorption of the birth control’s ingredients.


  • 3

    I can’t seem to get any sleep


  • 4
    Thomas Cook

    I used stacker 3 xplc to improve my energy at work. I thought everything was ok at first but after a year of one pill a day it affected my kidneys. I read the label and found meny warnings about my symptoms. I have no family history of kidney stones but I did develop a 13 mm kidney stone during the use of this product. I wish I would have been more aware of what harm stacker products can do yo my body. No stars only pain and regret.


  • 5

    Hi. I would NEVER recommend any stacker product. I had the same reactions as Loraine but worse! It’s been 5 days since my serious allergic reaction and I can still feel it! Major jitters and shakiness,red eyes, chest, arms ears, I couldn’t talk straight, my food doesn’t taste the same anymore, I also had major increased saliva. It was my worst experience ever in my 41 years of life. I am pissed.Also, be careful if you are on any prescription med because there is nothing that suggests anything about interactions with meds. I am on Lyrica, amatript, and tramadol for fibro. THEE biggest mistake. For everyone… PLEASE INVESTIGATE FIRST!



    it made me sick to my stomach. i thought i was gonna die. couldnt function. my stomach is still messed up! class action lawsuit??



    Why would you sue? You take the product at your own risk. Most diet pills you take make you feel sick if you do not eat first. You will not win anything. That’s like drinking milk and then you break a bone and sue them because you said it didn’t make your bones stronger. You are just sue happy and the first time things don’t go your way you want to sue. Good luck though.


    cathy August

    My son bought these and didn’t like them. My best friend is getting married and I needed to lost weight. I took two just today (08/22/14)for the next 8 hours I couldn’t hold my head up for if I did I would feel so sick and dizzy body hurt so bad I would get this over whelming sick feeling at first I thought I had gotten food poising then it hit me I was (at 55 experiencing high blood pressure and it one that I don’t want to ever experience this pill changed my life! People if you are over 50 please make sure that you can take these pills just ask your doctor! Please don’t be like me and just take them! I have a whole new outlook on people who have high blood pressure! The only good thing that came out of this experience! I will be able to know the early signs of high blood pressure.


  • 6

    I am on blood pressure medication are stackers 3 good to take yes or no


    Cameron (Editor)

    This company does contain caffeine, but only your doctor could give you the OK.


  • 7

    I have always been overweight. After the birth of my 3rd child I decided to give stacker3 a try. I started out taking 1 pull in the morning, 2 in the afternoon and 1 before dinner. Cut down on my food intake, avoided sodas and sugared down drinks. Exercise was moderate, not everyday. My weight when I started was around 240lbs. By the 7 month of using stacker3 I was down to 170 and felt amazing. I went from a size 26/28 to a 14!



    So you would recommend this? I’ve taken it in the past just for the caffeine and it definitely work for that. And no issues with it wver, for me.But I’m thinking about trying it for weight loss. So you still take it?


  • 8

    I have a step daughter that has abuse drugs in the past she come in yesterday morning throwing up and bouncing off the wall she said she took the deit pill stacker can this make you that way.


    Your Name

    Yes it can I use to have a prob with meth I have been clean for 3 years and I’m 19 and I take theme they will make you feel like you have did about $20 worth of meth she may be telling the truth hope she stays clean it can be a hard time coming but wish her best of luck



    I used to have a big problem with 3 different types of drugs and thank God I was able to quit before my children came along. I now use stacker 3 XPLC and it makes me feel like I’m back to my old ways. But I take only 2 a day instead of 3 and I feel like I’m back doing what I used to do. I cook, clean, talk alot, and 8 have been asked the same thing by my family, but I went to take a drug test for them and all of them watching so they knew I was telling the truth. Clean as a whistle… but yes it will make her seem as 8f she is back on what she used to be doing. Hope that eases your mind a little bit God bless and may her sobriety Stay strong


  • 9

    Trying the S3 XPLC, Been on it for less than a week. I have tried S2 before and did not really notice any weight decrease, but no jitter or negative impact on me. I have also tried the prescribed Phentermine, but that gives me bad dreams, and makes me edgy, short tempered so I stoppped it. It does provide great energy but that another story.

    For taking the stackers, if it is your first time around, I do recommend eating first. For this time, I needed extra energy to get pass the afternoons at work, it does provide good energy for about 2-3 hours, but then after you get so hungry. I just supplement it with eating fruits or drinking more water. So far so good. I have 3 of these bottles and hope to help me supplement weightloss plan with my strict diet – no rice & no red meat + more fruits and veggies.


  • 10

    I used stacker 3 and lost over 60 lbs …I love this product not only do i look great i feel fantastic my self-esteem is thru the roof 🙂


    Your Name

    How long did it take you to loose that much wight???


  • 11

    I used Stacker 3 for weight loss and all it did was make me nauseous, bloated and irritable.


  • 12
    jessica deem

    Would stackers 3..cause me to be very mean and edgy ? Cause me to not be able to sleep at night with the feeling of panic and restlessness ?


    Your Name



    Your Name

    Yes. I only take Stacker 3 in the morning with breakfast and never after 10am or I can’t sleep at bedtime, which is 9pm. As long as I take it early, I’m fine.


  • 13

    does stacker 3 give irregular periods?


    Cameron (Editor)

    We haven’t heard of this happening to dieters. Better have your doctor take a look Kim. In the mean time you might want to stop taking it.


  • 14
    Stacker User (year 8)

    It is a great product, but you have to be careful when taking them. Always eat about 20 min before you take the capsule. I’ve turned for “stacker xplc” for energy and weight lose needs for the past 8 years and I can confirm it works, But it is very easy to abuse.
    I only buy the four capsule pack that you can get from most any store or gas station in my area. When dieting it is really easy to take one after every meal, But be careful.
    If you do not eat properly, keep hydrated, and get active (active can be anything from walking your dog, going to yoga, or going to work) then side effects will happen.
    I’ve experimented with how far I can push these pills and I warn all users, be careful.

    Try not to take more than 3 in a 24 hour time span.

    If you do take these multiple times, you may feel that your body is used to the suplement and want to take 2 in one setting. I’m here to say, I’ve done it. I used to take 2 before work and chug them both down with an energy drink right before walking into the door. It does suck on your stomach if you have to sit around, but where I wait on tables it not only boost my speed, but the pain in my stomach was incentive for me to stay on my feet and stay busy. Which, in my case, caused me to make more money and try harder.

    Do I take these everyday?

    No. But there was a time when I did and do yourself a favor. Don’t. I find it is best to take at least an afternoon, or a morning, to rest and relax after taking any amount of dosage.

    For my brand of “Stacker” capsules, the serving size is 1 capsule.
    But listen to your body! Just because I can take multiples does not insinuate that it is okay to start out like that. Use the reccomended dosage of whatever brand you buy for at least a month before trying to push your own body.
    If you push yourself too much, you will get sick. Expect to lose your appetite until the capsule fully dissolves and passes through your system.(which for dieting this is very good for me)
    Stay hydrated or you will get dizzy and need to sit down for a good minute.
    (If this happens, don’t stress. Sit down and drink a full glass of water. Take five long breathes. And munch on some crackers or small bit of food, whatever you can stomach, in small amounts for the rest of the day until you are able to lay down to rest and let everything pass through.)

    Do NOT force yourself to eat a whole lot if this happens to you.

    It just makes everything worse. I’ve experienced that I cannot hold anything down so I drink more orange juice, tomato juice, or soup for the rest of the day. Hot water, Lemon and honey helps as well.


  • 15

    Stackers are awesome!! Some people may be allergic to them and that is unfortunate, but still not a reason to not recommend them because obviously not everyone is going to have an allergic reaction. And the two MAIN things you need to know before taking this product is to drink plenty of water and get moving!!! Do not take this and then sit around all day because it will make you feel crappy. If you are up and moving you feel just fine! Love it love it love it (:


    Your Name

    Did you lose weight?


  • 16

    I first used Stacker 3 for weight loss, and I did not notice any weight loss, but I did get a lot of energy. I now use it to pull al nighters for school. I think it really helps. I also lose the hunger for like 2-4 hours and then I get very hungry afterwards. I am just very satisfied with the amount of energy it gives me to stay awake and alert, and to workout even longer and more intensive. I think this may be better than the 5 Hour Power Energy shot.


  • 17

    I take Stacker 3 to help increase the results of exercise and to get a little extra energy. If I take it without eating about 20 mins after I do get jittery, but if I do something active like a workout or cleaning the house or playing with the kids I do not get jittery. I like them just for the extra energy but apparently have not taken them long enough (less than 1 week) to see weight loss results. Overall, thumbs up!


  • 18

    a coworker gave me 1 and it made me very very jittery. increased my heart rate and breathing to the point where I had to sit and just breathe for a minute. made me very cold and have the shakes, increase saliva, a runny nose. not really sure if I would try it again it was not really worth it.


  • 19

    IYears ago,I tried Stacker 2 then 3.. It was taken off the market,sadly. The New Stacker 3 xplc is potent.I ate first then took the pill.1st use and I was really jittery but had tons of energy(IM 41)
    I will continue to use it.


  • 20

    Well I like Stackers but they made me very sick while I was at work and had 2 leave work I got cold sweats watery mouth weak knees I tried eating nothing helped I had 2 leave work and went home and got sick and then went to sleep I usually take stacker 2 but figured I would give them a try Won’t again Loaine Van Kirk 1224 Commerce St Wellsville Oh. 43968 phone # 3307080941


    Your Name

    You have to have food on your stomach, drink plenty of water and liquids, and you have to take it when you are moving around, cooking, cleaning, dancing, working, running, walking just stay busy.. Drink! Drink! Drink! Your urine will let you know if you drinking enough water because if it’s yellow and not almost clear you are not drinking enough water and fluids.


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