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Burn Lab Pro Fat Burner Review – Is It Worth Buying?

Connor Sellers
Published by Connor Sellers
Fact checked by Donald Christman, BHSc FACT CHECKED
Last updated: November 16, 2021

A major priority of the health and fitness plans I put together for my clients is reducing fat and BMI, and Burn Lab Pro Fat Burner is a product that is frequently recommended to and by me for exactly this purpose.

Fat burners, when coupled with a careful diet plan, regular exercise, and even some intermittent fasting, can really speed up the process of achieving your body composition and weight loss goals and Burn Lab Pro Fat Burner is considered by many to be the best fat burner on the market.

In this Burn Lab Pro fat burner review, we’re going to look at its mechanism, the ingredients and science behind it, and how/if you should take it yourself to burn fat and gain muscle mass.

Also, to avoid confusion, they recently got rebranded to Burn Lab Pro; the old name for these supplements was Performance Lab. So whenever you encounter Performance Lab, or Performance Lab Sport, bear in mind that is the old name, but the same fat burning supplement.

How Does Burn Lab Pro Work?

Burn Lab Pro Product on a table

Generally speaking, body fat breakdown and weight loss will only happen if your energy expenditure is higher than your energy intake on a consistent basis.

That means that your exercise, training, and normal body functions need to use up or burn more calories than you take in through food. Only then may you burn fat and start getting that lean muscle mass.

The metabolic functions that target the storage of fat cells are called thermogenesis and lipolysis, and we’ll take a look at how this caffeine-free fat burner helps your body lose fat.

So, I’ve given you the really short version of how your body stores and removes fat, and how  fat loss actually work.

The good news is that there is more than diet and exercise training that can help you lose fat, and I want to focus on what the Burn Lab Pro fat burner supplement is designed to do, especially when combined with fasted training.

To do this, I first had a lengthy conversation with my dietitian, and we went through all the ingredients (more about these in the next section) to figure out what kind of benefits each might deliver to your body composition and appetite control. I thought this discussion was necessary especially that she mentioned that UFC superstar Aljamain Sterling -- yes, the Funk Master himself -- has been using Burn Lab Pro to prepare for his upcoming fight.

So how does it really work?

Suitable For Men & Women

burn lab pro

Burn Lab Pro

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1. Thermogenesis

Opti-Nutra is a UK-based company, and they claim to have created a stimulant-free thermogenic supplement. While caffeine is known for its fat burning ability, other ingredients like black pepper and forskolin provide similar benefits.

Essentially, this process involves slightly raising your body temperature resulting in more calories burned, which can lead to fat loss (1).

Check this video out to know more about thermogenesis.


2. Lipolysis

Lipolysis is generally triggered through fasting and exercise. When your dietary energy doesn’t support all your energy needs for physical activity, then your metabolism will first target glycogen, and then fat (2).

This fat burner from Burn Lab claims to have made a formula that increases certain hormone levels that trigger this fat burning process more effectively.

What Are Ingredients of Burn Lab Pro?

1. HMB (HMB ß-Hydroxy ß-Methylbutyrate)

Supplement Facts for Burn Lab Pro

This abbreviation stands for ß-Hydroxy ß-Methylbutyrate formula, and you really only need to remember it as HMB, often found among the ingredients in similar products.

This is the headline active ingredient, and the claim is that it can trigger the same fat loss processes as fasting would [3].

The problem with fasting is that it can also reduce muscle mass. One study from 2017 confirmed that HMB is a metabolite through tests conducted on athletes, meaning that when used as a supplement, it can help achieve lean muscle mass and lean body overall.

HMB is a naturally occurring byproduct of leucine breakdown. It behaves similarly to leucine in the body; both independently increase muscle protein synthesis and inhibit muscle protein breakdown, though leucine is better at causing protein synthesis, and HMB is better at inhibiting protein breakdown and also mitigating muscle damage in response to training.

- Greg Nuckols, Exercise and Sports Scientist

Burn Lab Pro uses the calcium form of HMB (HMB-Ca) which is known to have higher absorption. However, it seems that recent studies confirm that the free acid form of HMB (HMB-FA) has better bioavailability and absorption than HMB-Ca [4].

2. Coleus Forskohlii

Coleus Forskohlii

The ForsLean® or coleus forskohlii root extract has been added to a thermogenic fat burner with the claim that this ingredient triggers thermogenesis and helps regulate metabolic hormones [5].

One study I found was conducted in 2015, and the results showed that when combined with a calorie deficit, coleus forskohlii or ForsLean can be helpful to regulate metabolic rates which is why it is commonly used in supplements.

ForsLean may not be the most effective solution for muscle gain, but all indications point to it being safe and helpful for fat loss, making it a common active ingredient in some of the best fat burners.

Many users were happy with the visible fat loss within just a few months of taking the product, which may be caused by this popular thermogenic.

3. Cayenne Pepper Extract

Cayenne Pepper Extract

Now, before you think that Capsimax cayenne pepper as any other chili pepper will burn away your taste buds and cause all sorts of stomach upset, this extract will do no such thing [6].

Cayenne pepper extract in all its nutrient forms has long been known to work well as a fat burner and an appetite suppressant, but a recent detailed study was able to draw a scientific link with its ability to burn fat. That's why you'll find this chili pepper extract as an ingredient in some of the best weight loss supplements.

And unlike caffeine, cayenne pepper will not have the stimulating effect, which can be a problem later in the day, causing sleep issues. I hear that caffeine presence concerns a lot in many fat burners.

My clients who are sensitive to caffeine always appreciate it when I recommend stim-free fat burners that can increase their energy levels without the nasty side effects. But this product falls short of getting the boost they need for workouts.

4. Black Pepper Extract

Black Pepper Extract

Similar to cayenne, BioPerine black pepper is known to stimulate thermogenesis, but this ingredient has a little weight loss bonus attached to it. One study has shown that BioPerine black pepper extract can inhibit a process that leads to excess energy being stored as fat [7].

Combined with all the other ingredients, this means that thanks to BioPerine ingredient, you’ll be more likely to lose weight and keep it off at the same time.

To sum it all up, this supplement has 30 capsules per bottle, and the main ingredients are GTF chromium (90mcg of GTF chromium per serving), HMB (1500mg per serving), calcium, ForsLean(coleus forskohlii root extract, 375mg of ForsLean), Capsimax Cayenne pepper and BioPerine black pepper extracts(3.75mg of BioPerine per serving).

Based on online reviews, some users have been stocking up on Burn Lab Pro since they were noticing significant fat loss for several months already when combined with regular exercise and proper diet.

5. NutriGenesis® GTF Chromium

This trace mineral, presented as Glucose Tolerance Factor (GTF), is known to enhance insulin activity, which can promote significant fat loss. For faster results, it contains whole-food cofactors that can boost its absorption and bioavailability.

Research shows that it may improve insulin sensitivity which can help with regulating appetite, stabilizing energy, and improving endurance to cause fat loss. It is also proven that among different forms of chromium, GTF performs the best in reducing insulin resistance [8].

To sum it all up, this supplement has 90 capsules per bottle, and the main ingredients and amounts per serving are GTF chromium (90 mcg), HMB (1500 mg), calcium (262.5 mg), ForsLean or coleus forskohlii root extract (375mg), Capsimax Cayenne pepper (75 mg) and BioPerine black pepper extracts (3.75 mg).

It's also worth mentioning that this fat burner supplement is vegan - the product has a completely plant-based formula, non-GMO, free of any synthetic additives, soy-free, caffeine-free and gluten-free. This is great news for those looking for 100% natural products and gluten-free fat burning supplements.

Based on the scientific research my dietitian provided me with, there is very good evidence of Burn Lab Pro being a good solution for fat loss and calorie burning when combined with a diet and fasted training regime that increases energy expenditure.

Check out our list of other reviews:

Burn Lab Pro Side Effects

man picking up a bottle of supplements

The good news is that all the ingredients are generally classified as safe to take. Unless you have a known allergy, there shouldn’t be any reason for concern and potential side effects of this product.

What I always suggest with any new type of supplements, is that you aim to take it with food.

This will reduce the risk of any stomach upset, which is one of the common side effects of any fat burner supplement.

Based on reading hundreds of reviews, my clients’ experience, and my own test results, I have to say that there's one side effect that bothered me, which was also backed by online reviews and feedback I got.

It messed up with my bowel movement and caused an upset stomach. This experience was evident during the first few days of trying it out.

If you're considering taking this fat loss supplement, I suggest taking it at a lower dose for a few days and just avoidtaking it whilst fasting.

Suitable For Men & Women

burn lab pro

Burn Lab Pro

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When Should You Take Burn Lab Pro?

For maximum benefits, it is recommended that you take 2 capsules about 15 minutes before you start training.

This allows your stomach to absorb the active ingredients and for them to start kicking into action.

The idea behind combining it with a training session is that your body will trigger normal fat-burning processes through physical activity, and Burn Lab Pro burns more calories that will give your moves that little bit of an extra boost.

Also, keep in mind that if you have been in a bulking phase for training, that your diet shouldn’t be a source of increased calorie burning when taking fat burners.

Tune it down a bit and start measuring your fat reserves.

How To Get The Best Results

healthly lifestyle

Now, it goes without saying that you need to have a healthy diet that supplies all the nutrients your body needs. Whether that’s paleo, keto, vegan, or any other diet that takes your fancy, it’s important that you eat well.

But there are a couple of other things that you can do to boost the fat loss effects of Burn Lab Pro Fat Burner supplement.

1. Extended Fasting

Fasting is a great way to kick your metabolism into fat-burning mode. The lower your supply of blood sugar is, the more your body will aim to get some energy from fat cells, or fat reserves. In other words, through fasted training, by lowering your blood sugar, you'll encourage your body to use the energy stored in the fat cells.

Combining training with some moderate-to-high intensity cardio training after fasting, then you can really see some significant fat burning results.

2. Get Enough Rest

I always ask my clients to track their sleep using a sleep monitoring app. Whether you’re in a cutting phase as a bodybuilder, working on that lean body,  or just want to lose some love handles, your body needs to rest and recover after training, especially fasted training.

This is also a time for your metabolism to assess the energy supply, and any kind of sleep interruptions can cause problems for your weight management.

3. Stack With A Pre-Workout

The Burn Lab label range also offers a very popular and effective pre-workout supplement. The ingredients of the two products are not overlapping, so you can really achieve a boost in the effectiveness of your fat loss and muscle building training by taking these supplements.

You’ll be able to work harder on muscle growth and for a longer period of time, knowing that you’re also maximizing your fat metabolism.

Where To Buy Burn Lab Pro

I always recommend going directly to the source and order from the company’s website. While Amazon has got plenty of offers, you won’t get a better bulk offer per bottle than directly from Opti-Nutra.

It’s also the only way you can really guarantee you’ll receive the real product. There are so many counterfeit products out there, and when it comes to something that you put in your body, there’s no way you should take any risks.

Fat Burner Alternatives



PhenQ is considered one of the most effective fat burners in the market that It uses all-natural ingredients to target five angles to lose weight: reduce stored body fat, suppress appetite, block fat production, increase energy levels, and boost focus and motivation.

Unlike Burn Lab Pro which uses HMB and Coleus Forskohlii, it contains caffeine to boost metabolism, L-carnitine to enhance energy, and nopal to regulate your appetite.

It’s a bit pricier than Burn Lab Pro, but it's a 5-in-1 weight loss pill that’s proven to work for both regular people and bodybuilders.



Similar to Burn Pro Lab, LeanBean is a 100% vegan-friendly, all-natural fat burner that aims to boost thermogenesis and control appetite for a more effective weight loss.

It contains a small dose of natural caffeine, thermogenic ingredients like green coffee bean and turmeric, appetite suppressing ingredients like glucomannan and chromium, and B vitamins for reduced fatigue and immunity support, which you won’t see in Burn Lab Pro.

The only downside is you would need to take 6 capsules per day, compared to just 3 with Burn Lab Pro.

But apart from that, it’s a female-friendly fat burner and appetite suppressant that can help women shed excess fat and curb cravings.

Instant Knockout

Instant Knockout Box

Instant Knockout Cut, like Burn Lab Pro, is a 100% vegan-friendly fat burner that accelerates metabolism and thermogenesis to lose weight.

But unlike Burn Lab Pro which only targets fat burning and appetite suppression, it contains caffeine and green tea extract to promote thermogenesis, glucomannan to curb appetite, and L-theanine to improve memory and focus.

It’s originally formulated for bodybuilders and performance athletes, which can explain why almost all its ingredients are in high doses compared to those in Burn Lab Pro.

It’s an all-around fat burner for both fitness enthusiasts looking to burn more fat and performance athletes looking to maximize muscle growth, strength, and endurance.


burn lab pro faq

Does Burn Lab Pro fat burner work?

Yes, Burn Lab Pro fat burner works, and based on my own experience and client feedback, it has proven to be very effective. With only natural ingredients and no dodgy chemical crap(being non GMO, gluten-free and stimulant-free), it’s also a perfectly safe option.

Do you have to train fasted for Burn Lab Pro Fat Burner to work?

You don’t have to train fasted for Burn Lab Pro Fat Burner to work, but fasted training is recommended and will help you achieve your fat loss goals much quicker. You have to work out what works best for you and what you can manage.

Can you take Burn Lab Pro Fat Burner without exercising?

You can take Burn Lab Pro Fat Burner without an exercise routine planned but you won’t see the same weight loss potential if any at all. This product, like all the fat burners is designed to be used in conjunction with a healthy diet and exercise plan and not using it as intended is not advised.

Is it okay to take Burn Lab Pro Fat Burner with caffeine?

Yes, you can take Burn Lab Pro Fat Burner alongside your regular caffeine fix. It's a caffeine-free fat burner so you don’t need to worry about jitters and caffeine is a natural energy booster, appetite suppressant, and fat burner. So the two actually complement each other.

Is it vegan friendly?

Yes, Burn Lab Pro Fat Burner is a vegan-friendly fat burner according to the ingredient list.

What are the side effects of it?

There are no major side effects. As previously mentioned, it's caffeine-free so it won't keep you up all night and shouldn't disrupt your sleeping pattern in any way. However, it is recommended to take supplements with food to avoid any stomach issues. It may cause a stomach upset which is why you should take it with your meals.

What's the recommended dose?

For the best results, it's recommended to take 2 capsules 15-30 minutes before your fasted training. Also, there are 30 fat loss capsules per bottle.

Can I use it with other supplements?

You most certainly can. For better performance and muscle growth, try combining it with some of other products of the same label, such as Burn Lab pre-workout fat burning supplement. The ingredients of these supplements complement each other well.

Here are some popular fat burners you can combine with other supplements:

Editor's Note: Is Burn Lab Pro Worth Buying?

Based on all the research I’ve done, along with many hours of carefully browsing through pros and cons, reading online review comments and some personal experience, I have to say that Burn Lab Pro Fat Burner is a decent product.

However, I'm on the fence whether it really is one of the best fat burners as it did cause a few digestive issues when I tried it out. One best fat burner that by far, hasn't disappointed me nor caused any adverse reactions is PhenQ.

With PhenQ, I have achieved faster results in my own cutting phases, and clients with weight issues have surprised me by how faster they have been able to achieve their weight goals.

As long as you use the PhenQ fat burner alongside a healthy diet, some intermittent fasting, and continue to push it in the gym, this product can work in conjunction with your body to shed excess weight. This weight loss supplement is designed to help you burn fat the right way.

There is no miracle pill and it still takes hard work, but with PhenQ, you’ll get there quicker without the side effects.

Other users have also found it effective for fat loss. The images here speak for themselves:

Taylah results PhenQ
Nicola Before After v2

Our #1 Recommendation


Ingredient quality
Overall Score 5.0
  • Suppresses your appetite
  • Blocks body fat production to stop weight gain
  • Improves your mood and energy levels
  • High-quality, all-natural formula
  • Can be only purchased through the company website

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3 thoughts on “Burn Lab Pro Fat Burner Review – Is It Worth Buying?

  1. I’ve had a similar experience with this product, too. Even if you ate something before taking it, it still unsettled your stomach, made you feel sick and made you feel like you were about to vomit. According to the instructions, start with one capsule. I attempted to increase to the required two twice a day but felt worse and dizzy as if I were lying down and not exercising.

    1. Thanks for taking the time to share your experience, Thomas. I’m sorry to hear that you had a negative reaction to Burn Lab Pro. I guess we’ve all had some unique side effects from this. Like all supplements, it works in one body and it does not with others.

  2. So far, I’m pleased with the outcomes. I went from Burn XT to Burn Pro series, and it appears like I’m still progressing. Feel more slender. It effectively suppresses my appetite. I haven’t felt sick at all. It is a lot of tablets to swallow, but it isn’t a big deal.

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