Force Factor LeanFire Review – Should You Use This Fat Burner?

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By Jack Cincotta, MS

Reviewed by Juliana Tamayo, MS, RDN - Last Updated

Force Factor LeanFire Review

Make no mistake, we all want to look our best. And fat loss is, unfortunately, a process that many people have to go through to get to their desired look, which can take a lot of time and effort. 

As a result, so many people today are turning to fat loss supplements to expedite the fat loss process. Unfortunately, many of these supplements don’t work very well, if at all, so consumers have to be aware of which products are actually effective. 

So in this article, we’re going to go over one specific fat loss supplement called Force Factor LeanFire to see if it has any value as a fat loss supplement. Continue reading this Force Factor LeanFire review to learn more about it, its ingredients, and more!

force factor leanfire

About Force Factor LeanFire

LeanFire is a fat loss supplement created by Force Factor, a brand that has been given the GNC Breakout Brand of the Year Award, GNC Rising Star Award, and New Brand of the Year Award. Force Factor has produced a large variety of supplements, with well-known options including Test X180, Alpha King, Total Beets, ProbioSlim, Force Factor Smarter Greens, Forebrain, and even an advanced fat burning formula called Leanfire XT.

Force Factor LeanFire is designed to stand out from the hundreds of other fat loss supplements out there by ensuring you lose the right kind of weight…fat, of course. It is featured by Verilean, but also includes a number of well-known ingredients such as caffeine, green tea extract, and cayenne. 

Overall, Force Factors LeanFire is engineered with clinically studied, scientifically formulated ingredients designed to supercharge the body sculpting process in both men and women. 

Force Factor LeanFire Benefits

The main benefits of Force Factor LeanFire are:

  • Increased Energy
  • Heightened Metabolism
  • Appetite Suppression
  • Rapid Fat Loss
force factor leanfire fat loss

Increased Energy

Fat loss can sometimes be draining, but Force Factor LeanFire includes ingredients to help stabilize your energy levels and mood, such as caffeine and l-theanine. 

Heightened Metabolism

Force Factor LeanFire is also advertised to ramp up your metabolism with ingredients such as cayenne pepper and garcinia Cambogia, so you can burn more calories even when at rest, leading to around-the-clock fat loss. 

Appetite Suppression

Force Factor LeanFire is also designed to decrease hunger and suppress your appetite, leading to decreased calorie intake and easier weight loss. 

Rapid Fat Loss

With Verilean and other clinically studied ingredients, Force Factor LeanFire is also promoted to help you lose fat quickly, and to make sure the majority of your weight loss comes from fat, not muscle. 

If you’re looking for a fat loss supplement, these benefits are surely all that you desire. But will Force Factor LeanFire actually deliver on its promises? Read on to find out!

Force Factor LeanFire Ingredients

All of the ingredients in Force Factor LeanFire are listed under their Thermovigilance Weight Loss Matrix. Below is what’s included in each serving (1 capsule):

  • Thermovigilance Weight Loss Matrix (700mg)
    • L-Theanine
    • Verilean Green Coffee Extract
    • Caffeine Anhydrous
    • Cayenne Pepper Powder
    • Garcinia Cambogia Extract
    • L-Carnitine
    • Green Tea Extract
force factor leanfire key ingredients

Alright, so let’s take a look at each of these ingredients one by one to see what they have to offer. 


L-theanine is an amino acid found in green tea that can help promote calmness, relaxation, and focus by increasing GABA, serotonin, and alpha waves in the brain. It can also reduce stress and anxiety. Plus, it improves cognitive performance when taken with caffeine. 

Recommended Dose: 200 to 400mg


Up next is Verliean, which is a trademarked form of green coffee bean extract. Green coffee bean extract offers thermogenic effects and can also help increase glucose metabolism, which may lead to more weight loss. 

Recommended Dose: N/A

Caffeine Anhydrous

Caffeine anhydrous is one of the most popular weight loss ingredients. Its stimulant effects on the central nervous system increase norepinephrine and adrenaline, which can boost the metabolism and increase fat oxidation. Plus, caffeine improves mood and alertness by increasing dopamine, serotonin, and other neurotransmitters. 

Overall, caffeine is effective for fat reduction and overall weight loss, especially at moderate to high doses.

Recommended Dose: 150 to 300mg

Cayenne Pepper

Another ingredient in Force Factor LeanFire is cayenne pepper powder. Cayenne pepper is rich in capsaicin, which offers stimulating effects and is able to increase thermogenesis, energy expenditure, and fat oxidation. Also, cayenne pepper helps to balance blood sugar, cholesterol, triglycerides, and even blood pressure. This hot pepper packs quite the punch!

Recommended Dose: 500 to 1,500mg

Garcinia Cambogia

Also included is an extract from Garcinia cambogia, a tropical fruit found in Asia. It is also one of the most well-known fat loss ingredients (you may have even heard it over the years on various tv commercials). 

Possible beneficial mechanisms include inhibiting various enzymes in fat and carbohydrate metabolism, while also increasing serotonin, which can suppress appetite. And overall, research shows Garcinia can help people lose weight and body fat, and reduce BMI. 

Recommended Dose: 1,500 to 3,000mg


L-carnitine is an amino acid found abundantly in skeletal muscle. It is believed that by increasing carnitine levels in the muscle, fatty oxidation will increase, leading to fat loss. And research overall shows that l-carnitine supplementation has a moderate effect on weight loss, particularly for overweight or obese people. 

Recommended Dose: 1,000 to 2,000mg

Green Tea

The final ingredient in Force Factor LeanFire is green tea extract, which is most known for its rich catechin content. Green tea extract can increase fat oxidation, thermogenesis, and metabolism, especially when combined with caffeine. And it is overall moderately effective for weight loss and body fat reduction. 

Recommended Dose: 200 to 400mg

Does Force Factor LeanFire Work?

It is likely that Force Factor LeanFire should work decently as a fat loss supplement, but not fantastic. 

To be sure, all of the ingredients included in this formula are very common and well-researched. They have been proven to increase metabolism and thermogenesis, boost energy levels, and ultimately increase weight loss and fat loss. 

force factor leanfire benefits

However, all of the ingredients are included in a blend only weighing 700mg; and since Garcinia cambogia alone is best when dosed to at least 1,500mg, it’s clear that there isn’t enough of each ingredient in here for maximal effectiveness. 

Since many of the ingredients have similar effects, this isn’t as big of a deal, but it still limits the overall effectiveness of this product. 

Claims vs. Reality

Force Factor LeanFire makes it seem like you’ll rapidly lose weight with this product, even doubling your fat loss efforts compared to if just diet alone. 

But in reality, Force Factor LeanFire will likely only help you lose a few extra pounds over a couple of months or so. 

It still works, but just keep in mind that it won’t be anything miraculous. Yes, caffeine, green tea extract, cayenne pepper extract, etc., are all proven to aid weight loss, but this really isn’t ever more than a few extra pounds in the studies, so just keep that in mind. 

Who is Force Factor LeanFire Best For?

Force Factor LeanFire is best for anyone who wants to lose a little extra weight while also improving their overall metabolic health.

If you’re sensitive to stimulants, though, the inclusion of caffeine in this formula may cause some hesitation. If you prefer to avoid this ingredient, you may want to check out other fat burners, like Enhanced Athlete Code Red or Xyngular Accelerate, which are caffeine-free.

force factor leanfire

Get the BEST deal

Force Factor LeanFire

  • Formula includes L-Thenine, Verilean Green Coffee Extract, and more
  • Made in the USA in a GMP-certified facility
  • Benefits energy levels, metabolism, appetite suppression, and fat loss

Is Force Factor LeanFire Safe?

Possible side effects of Force Factor LeanFire include:

  • Anxiety, nervousness, irritability, and insomnia
  • Increased heart rate and blood pressure
  • Nausea, vomiting, bloating, upset stomach, and other digestive symptoms
  • Headache
  • Dizziness

Also, Force Factor LeanFire is made in the USA in a GMP-certified facility. There isn’t any specific allergen information. 

Lastly, don’t take Force Factor LeanFire within four hours of bedtime (be even more conservative if you’re more sensitive to stimulants). 

Where to Buy Force Factor LeanFire

You can buy Force Factor LeanFire at this product link.

force factor leanfire website

A one-time purchase of Force Factor LeanFire is priced at $64.99. Additionally, you’ll get free shipping on the GNC website for any orders over $49.

Final Verdict: Force Factor LeanFire Review

Force Factor LeanFire is a decent fat loss supplement that comes with well-researched ingredients, but there are probably better fat loss supplements out there that have more optimal dosages. With that being said, since it’s so affordable, Force Factor LeanFire could be worth trying as an initial fat loss supplement if you need just a little extra boost.

Overall Rating:
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Jack Cincotta, MS

Jack Cincotta is a certified holistic health coach through AFPA and a board-certified holistic health practitioner through AADP. He has written hundreds of articles on nutrition and supplementation. Jack has a M.S. degree in Psychology and is passionate about researching the science behind nutrition. He often uses research-backed supplementation protocols for many of his clients to optimize results.

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