Updated: 12/05/2017

LeanFire XT promises to “incinerate fat” so we wanted to get into the ingredients first. Right away, we noticed a couple of components that can cause some serious side effects. We also discovered that their proprietary fat-burning blend is kept a secret, and not knowing the exact formula can be an issue. Additionally, our team couldn’t find any scientific evidence on this supplement – which just bums us out. Regardless, we summarized our findings to deliver you the bottom line on this thermogenic.

LeanFire XT Readers: Click here to find out why we're giving away samples of our product, Burn HD.

What is LeanFire XT?

First off, LeanFire XT is an “advanced thermovigilance formula” for both women and men. According to the bottle, this supplement helps incinerate fat, amplify focus and clarity, and improve endurance levels. The only problem is, the list of potential bitter orange side effects is longer than the Golden Gate Bridge, but we’ll get more into that later.

This formula contains:

Other ingredients include Yohimbine HCL [2] and DMAE [3], but the two that have us nervous are bitter orange and caffeine anhydrous – two powerful stimulants that, when thrown together, can cause high blood pressure and increased heart rate.[1]

You’re supposed to take 1-2 capsules daily on an empty stomach to see any results.

From what we gathered, LeanFire XT was first released this year. It’s made by Force Factor, a company located in Boston, MA. This is one of the several supplements available from this brand.

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LeanFire XT Ingredients – “Things Look Good”

The first issue we address is with LeanFire XT ingredients. According to our Research Editor, “This diet supplement contains a blend of herbs, such as bitter orange and caffeine. These are both strong stimulants that have been shown to help support metabolism.”

One customer stated, “Gives me a boost before workouts. I think it helps reduce muscle fatigue.”

Another commented, “It’s not bad. Just don’t take it in the evening or it [may] ruin your sleep.”

LeanFire XT Customer Testimonials

LeanFire XT Side Effects – “Not According to Most Reviews”

We found that many customers who’ve taken the plunge and tried the fat burner had good experiences without LeanFire XT side effects.

One individual stated, “Provides an energy boost. Take it before work in the morning.”

“Gives you some energy, as long as you don’t overdo it. Kind of like an energy drink or shot,” revealed another.

According to our research, if there is a particular aspect of a diet pill or weight-loss supplement that is a concern (questionable ingredients, side effects, steep cost) the odds of real, long-term results are not good. It doesn’t look like LeanFire XT has any of these issues.

LeanFire XT Results – “Find Any Proof?”

LeanFire XT does contain some promising ingredients like green tea and caffeine to help boost metabolism [4] [5]. Even the bitter orange is a stimulant that can get calories burning [6]. Here at DietSpotlight, we love to see a formula that can honestly work, based on research.

The Bottom Line – Does LeanFire XT Work?

Now the moment you’ve been waiting for. This is our bottom line on LeanFire XT. It’s nice to see that this formula is sold with a money-back guarantee. The green tea, caffeine and bitter orange will undoubtedly get your metabolism rolling. Taking all this into consideration, this isn’t a bad choice.

The green tea, caffeine and bitter orange will undoubtedly get your metabolism rolling. Taking all this into consideration, this isn’t a bad choice.

If you’d like to get rid of some excess pounds, then we encourage you to go with a product that is backed by solid clinical research, does not contain any dangerous ingredients and will not lead to harmful side effects.

Another formula that works with clinically tested ingredients is the supplement Dietspotlight Burn. It offers a blend of four essential ingredients chosen because results of research shows they can help with appetite, metabolism and fat loss. It’s also impressive just how many people have tried it and reported amazing results.

Also, they’re so confident in the product that they’re offering you Special Trial Offer, a good sign.

Learn More About Burn HD »
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LeanFire XT

What are the ingredients in LeanFire XT?

LeanFire XT ingredients are green tea leaf extract, L-carnitine, cayenne pepper powder, Advantra Z bitter orange extract, caffeine and yohimbine HCL.

Does LeanFire XT work?

The metabolic boost from caffeine [1] and the thermogenic effect of Advantra Z [2] could help with weight loss.

How do I know if LeanFire XT is right for me?

Choosing the right product is the #1 question asked by DietSpotlight readers. We recommend trying any product before buying it and know that finding a product with a sample offer is near impossible - so we created our own product, Burn HD, with scientifically backed ingredients.

Click here to get your sample of our powerful fat burner today.

How much does LeanFire cost?

LeanFire XT costs $99.99.

How should I take LeanFire XT?

You are supposed to take one capsule in the morning on an empty stomach.

Who are the makers of LeanFire XT?

The makers of LeanFire XT is Force Factor.

If I am a coffee drinker, can I still take LeanFire XT?

Since LeanFire XT contains caffeine, adding coffee may increase the likelihood of side effects.

What is LeanFire XT?

LeanFire XT is a health supplement that prioritizes losing weight quickly and efficiently. It burns fat by increasing metabolism and limiting hunger, while also providing energy.

What are the LeanFire XT ingredients?

TheaCrine, caffeine, L-Theanine, green tea leaf extract, cayenne pepper fruit extract, Bioperine, L-Carnitine, Advantra Z, Yohimbine Hcl, and DMAE are the ingredients that comprise LeanFire XT.

Are there any LeanFire XT side effects?

Among the potential side effects for LeanFire XT, there is an increased chance for headaches, anxiety, higher blood pressure, mild shaking, nausea, and lightheartedness.

What LeanFire XT results can I expect?

Possible results from using LeanFire XT are efficient fat-burning, an increase in energy and stamina, and an improved mental focus by minimizing anxiety and stress.

LeanFire XT Ingredients

Leanfire XT claims to help with "fat incineration." There are some beneficial ingredients in the formula, which is a welcome change when compared to so many other formulas on the market.

LeanFire XT Ingredients and Supplement Facts

Serving Size: 1 Capsule
Serving Per Container: 60
Amount per Serving% DV
Peak Thermovigilance Triplex721mg*
- Fat Incineration Blend**
-- Green Tea Leaf Extract**
-- L-Carnitine**
-- Cayenne Pepper Fruit Extract**
-- BioPerine**
- Metabolic Mind Matrix**
-- L-Theanine**
-- Caffeine Anhydrous150mg*
-- Teacrine**
- Pure Energy Complex**
-- DMAE**
-- Advantra Z**

Other Ingredients: Gelatin, dicalcium phosphate, magnesium stearate, microcrystalline cellulose, silica, titanium dioxide

We looked into the Leanfire XT ingredients to give you the details you need to make the most informed decision.

Green Tea Leaf Extract

Green Tea Leaf Extract is commonly found in Chinese and Indian tradition. It is an herbal version of green tea that contains antioxidants and is used in medicines.

What is it Supposed to Do?

Green Tea helps to lower cholesterol and blood pressure, increase athletic performance, and possibly help promote weight-loss.

Clinical Research

There have been many studies proving that green tea does in fact promote weight-loss. One of the studies done was in the International Journal of Obesity. They said, “Catechins significantly decreased body weight and significantly maintained body weight after a period of WL…”, [1] thus, proving green tea helps people lose weight.


L-Theanine is an amino acid analogue that is found in certain plants and fungus. In 1949, this amino acid was found in green tea.

What is it Supposed to Do?

L-Theanine is said to help relieve anxiety, improve cognition and reduce high blood pressure.

Clinical Research

According to a study published in Nutritional Neuroscience, “L-theanine and caffeine in combination are beneficial for improving performance on cognitively demanding tasks.” [2] This may not be a connection to weight-loss, but it does show that some claims are backed by science.

Caffeine Anhydrous

Caffeine is a stimulant that effects the nervous system. It is typically put into drinks such as energy drinks and coffee to help increase energy levels.

What is it Supposed to Do?

Caffeine helps relieve headaches, increase mental alertness, and it has been said to promote weight-loss.

Clinical Research

In study found in the International Journal of Experimental and Clinical Pathophysiology and Drug Research, “It has been reported that caffeine ingestion elevated the metabolic rate and fat oxidation in vivo through lipolysis in fat cells and the release of catecholamines.”

They continue on, saying, “Moreover, caffeine enhanced noradrenaline- or adrenaline-induced lipolysis in fat cells. We also obtained results which supported the anti-obesity activities of caffeine.”


L-Carnitine is an amino acid that is a component in lipid metabolism in mammals.

What is it Supposed to Do?

L-Carnitine may help with kidney disease, chest pains, fatigue, and help decrease hair loss.

Cayenne Pepper Powder

Cayenne Pepper Powder is a powder derived from a red pepper with a Genus of Capsicum. They are in the same Genus with bell peppers, jalapeños, paprika, etc.

What is it Supposed to Do?

Cayenne Peppers help relieve Rheumatoid Arthritis related pain, back pain, and help relieve headaches.

LeanFire XT Scientific Abstracts

Green Tea Leaf Extract

There is proof from in vitro as well as animal studies on the mechanisms of green tea catechins and their actions. There are human studies as well, using green tea catechins as a treatment for metabolic syndromes like obesity, cardiovascular risk factors, and type 2 diabetes. The long-term intake of green tea and its catechins may be helpful against high-fat diet induced obesity and type 2 diabetes and may decrease the risk of coronary disease. There needs to be further research which adheres to international standards, to monitor the clinical and pharmacological properties of green tea and to further study its mechanisms of action. [1]


The data showed that a high-fat diet greatly elevated final body weight, total cholesterol, triglycerides, and LDL concentration in comparison to controls. All of this while significantly reducing HDL, meanwhile the administration of L-Carnitine or Egyptian herbal treatment substantially normalized lipid profiles. Serum ALT, uric acid, urea, creatinine, CK-NAC, LDH, CK-MB were all substantially elevated in the high-fat diet group in comparisons with controls. The treatment of L-Carnitine or the herbal extract considerably decreased the effects of the high-fat diet. High insulin resistance, hyperglycemia, and hyperinsulinemia substantially increased in the high-fat diet group as opposed to the control group. High-fat diet elevated hepatic MDA and lipid peroxidation linked with the decrease in hepatic GSH and catalase activity. Treatment with L-Carnitine greatly ameliorated these hepatic differences. High-fat diet-induced obesity linked with a disturbed lipid profile, high values of insulin resistance parameters and poor antioxidant stability – which could have implications for the progression of issues related to obesity. L-Carnitine treatment improved obesity and the metabolic issues related to obesity. [2]


Resting energy expenditure was substantially elevated at all four time points and substantial elevations were seen for perceived focus (p = 0.05) and alertness (p = 0.026) at the first hour and energy at the first and second hours following treatment for the DBX (thermogenic dietary supplement) group (p = 0.008 and p = 0.017). In addition to this, fatigue was reduced at the first-hour mark (p = 0.010). There were no substantial differences noticed between DBX group and placebo group for anxiety, heart rate, blood pressure, hunger, ECG patterns or respiratory energy ratio. The outcomes of the study are in support of the blend of thermogenic aid and indicates that it has the potential to elevate respiratory energy ratio for 4 hours following ingestion while raising focus, alertness, and energy and reducing fatigue without triggering anxiety or any substantial changes in heart rate, blood pressure or ECG measurements in those who habitually consume caffeine. [3]

Summer Banks Dietspotlight Author
About the Author:

Summer Banks, Director of Content at Dietspotlight, has researched over 5000 weight-loss programs, pills, shakes and diet plans. Previously, she managed 15 supplement brands, worked with doctors specializing in weight loss and completed coursework in nutrition at Stanford University. full bio.

38 LeanFire XT Reviews

  • Dude

    Hi, i know the gelatin is not vegan but do you know what animal the gelatin is derived from like fish, beef, pork etc. Because my friend is from india and they dont eat beef

    • Maribel (Editor)

      Hi D., after some careful research we couldn’t discover exactly what specific animal the gelatin in Leanfire is derived from. But, it most likely derives from a combination of different animals, including beef and pork.

  • Need Answers

    I have no time to work out i work crazy hours , will this work without an exercise ????

    • Maribel (Editor)

      Hi Siani, yes and no. There is a slight chance you could see results while using this supplement (some of its ingredients will get your metabolism rolling). Nevertheless, to really achieve and sustain your weight-loss goals, we highly recommend that you find a way to keep a healthy and active lifestyle; diet and exercise are key for fast and long-term results.

      If speeding up your metabolism is currently your goal (since you don’t have time to work out), you might want to check out an alternative metabolism booster, such as Dietspotlight Burn.

  • Really need an answer to this

    Does anyone know if these will make you pop on a piss test? Want to try it but cant find any good information online, and this is the main thing I am worried about

    • Maribel (Editor)

      Hi, it should be okay and after some research it appears that you shouldn’t be worried. Either way, if you’re concerned its best to consult with your physician to make 100% sure.

  • Is this product vegan?

    Is this product vegan? I see that there it contains the ingredient gelatin. I have read that ingredients listed as gelatin, which is not vegan, could also really be agar sugar/gum, which is vegan.

    Also, what is the mechanism behind the fat burn?

    Would like to know these things before purchase.


    • Summer (Editor)

      Hi Psi. First off, no – Leanfire XT is not vegan. It is processed on equipment that processes animal products.

      As for the mechanism – the first ingredients you’ll likely notice are the caffeine and Advantra Z. These are both stimulants. There’s 150mg of caffeine alone, not to mention what’s in the green tea.

      Herbal experts and research agrees that natural ingredients, like some of the ones used in Leanfire XT, can take 4-6 weeks or more to reach full effect.

      So, the initial mechanism would likely be the caffeine.

  • Caffeine content


    • Victoria (Editor)

      Hello Tricia. 150mg per serving. There is also Advantra Z, which is a stimulant too. If you’re sensitive, that could affect how you feel.

  • Is there Gelatin?

    what are the ingredients? is there any gelatin in the capsule? thnx

    • Madine

      yes, there is Gelatin. It is listed as “Other Ingredients”. This increased my appetite. Probably due to the caffeine. Now I don’t even want to exercise. I dislike it.

    • Summer (Editor)

      Hi Nisha. The ingredients in Leanfire XT are:

      • green tea leaf extract
      • l-carnitine
      • cayenne pepper
      • black pepper fruit extract
      • l-theanine
      • caffeine
      • Theacrine
      • DMAE
      • Advantra Z
      • yohimbine HCL

      Yes, there is gelatin in the Leanfire XT ingredients.

  • So far so good
    Glory (Verified User)

    I took it today for the first time. I ate a cracker with peanut butter this morning then an hour later took one pill. I felt ok. It made me have a bowel movement after meals. However, it was a normal formed stool NOT diarrhea. Then, I decided to take another pill before my workout 1-2 hours after I ate. It definately gave me energy and a bit more of endurance. I also sweated like crazy today during my workout. However, I took the second pill a little too late (4pm eastern time) and I am WIDE AWAKE and by this time I am usually ready to fall asleep. I will take it again tomorrow and see how it goes. Do far no complaints. 🙂 I will provide update in a couple of weeks.

    • Kia

      Did you have any stomach pain? Whereas there any other complications or side affects when taking these pills? Just took my first one today and within 5 minutes I had a bowel movement and just feel intense inside. I shall see how the day go.

    • Victoria (Editor)

      Hi Glory! Sometimes, when you take a fat burner too late in the day, it can affect sleeping patterns. If that continues being an issue for you, a product that offers a caffeine free version is Dietspotlight Burn; you should check it out.

      • Crystal

        The product works but it’s keeping me awake at night as well. I took both pills before noon

  • Tummy ache issues

    I tried this product after hearing good things about it. While I realize the product has only been on the market a few weeks, I still decided to give it a try. I took one pill with my breakfast of fruit. I felt no noticeable increase in energy during my morning and early afternoon. I did, however, have severe stomach pain. I tried eating an energy bar, hoping that more food would help. Then ate lunch, hoping it would help. Nothing eased the pain at all. The pain was so bad that I left work and was in bed all day. Of course, the pain decreased my energy level. I will likely return this product, because at the moment I am not too keen on giving it a second try

    • BrandiKJ

      It instructs to take on empty stomach not with any food. Maybe that’s what caused the stomach ache?!?!

  • Michael mcintosh

    If I take 6 pills can I die??

    • Yedy Torres

      Hi Michael,

      We would not recommend to take 6 capsules a day, the daily dosage recommended is 1-2 capsules daily on an empty stomach.

  • diabeties

    is it good for diabetics

  •  So far so good!
    Heather Peavey (Verified User)

    Today is my 2nd day. Yesterday was great! Lots of energy. Took 30 minutes before breakfast and dinner. I knew I would be up late. Slept fine and no side effects. Woke up feeling great and motivated. Went for long early morning walk. Go me!

  • Maria (Verified User)

    I have been using it about 2 weeks I see a small change in my body 🙁 . It dose give you energy to the roof and no crash i like that .. but when they say it helps u lose weight I guess it works different in every one..

  •  Not effective for high caffeine consumers
    Carl (Verified User)

    I tried this product based solely on the hourly advertisements on Pandora and used it for two months. As background, I already consume large amounts of caffeine, including 4 cups of black tea and 2 Diet Mt. Dews daily, so my caffeine tolerance is higher than average. Taking 2 pills per day made no noticeable difference, either in fat burning, weight loss, heart rate, or energy. In fact, I can take a pill and then take a nap 2 hours later without a problem. I do not recommend this product for those with high caffeine tolerances.

  • Precautions

    So in the precautions section it says not to take with alcohol, driving or using heavy machinery. How am I supposed to take this product and not be able to drive? Definitely a bummer that I can’t take this product cause of that. And I haven’t tried the product because of the precautions. My job requires for me to drive and I’m not going to risk anything happening.

  • Mixing powder into foods to take.
    Patty (Verified User)

    Is it ok to mix into yogurt or oatmeal ? I know it tastes disgusting, but I was a bit afraid of jumping right in. Does anyone else open capsules & mix with anything?

  • Weight loss

    Does it help you lose weight ?

  • I didnt like it
    Jessica (Verified User)

    I started taking this product five days ago and I feel like crap, it doesn’t give me any energy instead it makes me feel really tired, dizzy, my appetite has gotten worse I have really bad headaches I was fine without this, I’m stopping this

    • Victoria (Editor)

      Hi. When in doubt, it is always a good idea to stop taking a supplement if it is making you feel bad, especially if the side effects are affecting your daily life.

      It’s interesting that you felt tired. Leanfire XT has several stimulants. These could be where the headaches and dizziness came from.

      Do you feel better now that you stopped?

    • Tanicha V Madrigal

      Are you active? Leanfire has worked great for me. I’m constantly on the run and lost an additional 2 lbs a week.

  • Im going to take a break from this product
    Need to look good (Verified User)

    I tried this product for 3 days day 1 I felt so tired 3 hours after taking next day took 1 pill as soon as I woke up showered got dress and ready for my day are breakfast then went for a fast pace walk after again felt really tired. Day 3 took one again but after I got showered and had eaten breakfast then went and did some family things as it was Memorial Day then went to lunch with my family after lunch I become very ill throwing up and a bad headache spent two and a half days in bed. I will try this again but I think it’s best to wait a week and try again.

    • Victoria (Editor)

      Hey. One pill supplies 150mg of caffeine. That can be too much for some people. When you took two that increased to 300mg of caffeine – or about three cups of coffee, according to the Leanfire XT label.

      When you tried it again, did you have the same reaction?

  • I didnt like how it made me feel
    Virna Kamakaloy (Verified User)

    From the moment I received the pills, I started taking it on an empty stomach,and eating within the next 20 min. Took it for 3 days without any side effects other than heart palpitations, I figured it was because of the caffeine. I stopped taking out for a week and started again today. I took a pill this am on an empty stomach. I ate 2 eggs and a toast. No coffee, but dranked a fruit smoothie. By the time I had finished the smoothie I got such unbearable pain on the back on my head that run all the way to the front. I started shaking, cold sweating with chills, I got nauseous and it send me to the bathroom. It’s been 10 hrs since I took it and my brain still hurts. I don’t think I’ll be taking it anymore.

  • Is it safe?
    Javaris Jones

    I am a diabetic and I was wondering it safe for diabetes?

  • Javaris (Verified User)

    Is it good for people with diabetes and does it make you go to the bathroom?

  •  Too many side effects
    Casey (Verified User)

    I just received the Product on Saturday I took my 1st pill on Sunday it made me extremely nauseous dizzy Period no energy to do anything I actually thought I was coming down with the flu or something period I took my 2nd pill about 3:30 p.m. and was up all night long still not putting 2 and 2 together I tried another pill Monday morning within an hour I was extremely nauseous dizzy and could not function Period I do not think I will be continuing this product as it has too many side effects for me I am a major coffee drinker but did not drink coffee as I could not while taking these supplements I was too sick . Not worth all the side effects

    • Victoria (Editor)

      Hi Casey! Were sorry that you had a bad experience with LeanFire XT. Have you researched other similar products? You should check out