Top 3 Fat Burning Supplements


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What Fat Burning / Weight Loss Supplements Are Most Effective?

We here at SupplementCritique.com strive to give you the most informative and unbiased reviews possible on a wide range of topics.

Recently, we have started testing a number of different fat burning and weight loss supplements for their effectiveness, and decided to start rating them.

Below you will find our top 3 choices for fat burning supplements.

We have personally tested these for their results, and unlike many of our competitors, we provide proof that we actually buy these products and test them.

We also make recommendations on the size of the order you should get, as well as what other reviewers are saying about these products.

These products were chosen on the basis of reliability, effectiveness, results, lack of side effects, and price point.

Our #1 Choice For Fat Burning – Instant Knockout

instant knockout reviewClick Here To Visit The Official Instant Knockout site

Click Here To Read Our Official Review

Instant Knockout is actually a relatively new fat burner to come to the market, and we actually had a chance to test it out before it was released to the public. If you haven’t heard of this supplement already, you probably will soon. It’s been highly praised on numerous other blogs / reviews, and I can see why.

During my official testing, I actually lost about 12 lbs. of fat, all while retaining (and even building) lean muscle mass.

Instant Knockout is made up of a proprietary formula which includes numerous fat burning ingredients, most notably Green Tea Extract, Green Coffee bean extract, and cayenne pepper.

The formula is further enhanced by a blend of antioxidants and nutrients, which include Vitamins B6 and B12, Zinc, Glucomannan powder, Caffeine, Black pepper extract, and GTF chromium.

Here’s a snapshot of the label:

instant knockout label

Unlike alot of other supplements in the weight loss category, it’s priced very reasonably, at about $59 per bottle. You can actually save big if you order larger quantities, which I suggest you do anyway to take advantage of their 90 day money back guarantee, as well as a free t-shirt offer.

So What’s So Great About Instant Knockout?

Well, over the summer I had gained about 7 or 8 lbs., and was looking for something to not only help boost my energy levels, but also burn off that excess fat. When I first started taking it, I knew it was going to be a game changer. The energy I got from just 2 capsules was through the roof, and as a result, my workouts were much more explosive and intense.

I started to see results in literally the first week, knocking off about 2 or 3 lbs without sacrificing muscle. Not only that, but I wasn’t ridiculously tired after my workouts, and it seemed to provide lasting energy throughout the day.

I also felt like it acted a bit like a nootropic supplement as well, giving me mental as well as physical energy. I was getting tasks done at a record pace, and can never remember feeling this good before.

Click Here To Learn More About Instant Knockout in my personal review.

Our #2 Choice For Fat Burners – LeanBean Female Fat Burner

leanbean fat burner reviewClick Here To Visit The Official LeanBean Website

Click Here To Read My Full Review

For a long time, I completed neglected the fact that I have a substantial portion of women that visit this site.

Most (if not ALL) of the fat burners that I’ve personally tested are geared mainly towards guys, but then it hit me…

There HAS to be something that’s specifically helpful for women and their weigh loss challenges.

So I started doing some research and finally stumbled upon Lean Bean female fat burner.

Lean Bean isn’t your typical fat burner.

Instead of just loading up a bunch of stimulants and slapping a fancy label on the front of the package, Lean Bean works both as a fat burner AND a potent appetite suppressant.

This is key, as diet is 80% or more responsible for your hitting your weight loss goals.

Their caffeine-free formula is vegan friendly, and consists of health all natural ingredients that include: Chromium, Green Coffe bean extract, Acai berry, Greeen tea extract, Turmeric powder, Glucomannan, Garcinia Cambogia, Cayenne Pepper, Black pepper, and Rasberry Ketones.

Here’s a snapshot of the label:

leanbean fat burner ingredients label

We received a 3 months supply from the makers of this supplement, and went to work testing it out almost immediately.

The effects were ENORMOUS, to say the least.

Click Here to read our full review to learn more.

Our #3 Choice for Fat Burning – Pruvit Keto OS

Keto OS reviewsClick Here To Visit The Official Keto OS website

Click Here to Read My Full Review

Coming in at #3, but by no means inferior, is Pruvit’s Keto-OS, which biohacks your body into ketosis within 30 minutes to become a fat burning machine for up to 24 hours.

If you’re not familiar with ketosis or the ketogenic diet, it’s when your body switches from burning carbs (glucose) to FAT!

Getting into nutritional ketosis is very difficult and often takes weeks to get there by following a strict diet with extremely low carbs.The beauty of Keto-OS is that by flooding the body with exogeneous ketones, you can quickly get into ketosis without changing your diet and start to shed body fat quickly and lean out.

Keto OS and Keto Max comes in a variety of flavors.

The fan favorites are the Keto Max Raspberry Lemonade, Heart Tart, Orange Dream and Swiss Cacao.

Keto OSis a powder you mix with water and drink up to twice daily for maximum benefits, and it actually tastes great! The Keto Max Maui Punch tastes like Hawaiian punch!

Over the past year both my wife and sister-in-law have used Keto OS and both have had impressive results. My wife lost 20 lbs on Keto Max over two years ago, feels amazing and has kept it off!

I was pretty blown away with her quick results!keto weight loss

She continues to drink it because she also loves the energy, the mental focus and the anti-inflammatory benefits.

It also suppresses the appetite so it makes it easier to eat healthy as well as curbs carb cravings.

Keto OS comes in a “Charged” formula with caffeine (about as much as a cup of coffee) and a Caffeine free version.

If you like the option of a drink vs. a pill, Keto OS may be just what you’re looking for to take your fat burning to the next level.

Be sure and check out our full review complete with before and after pictures with our personal trials.

Read our Full Review of Keto OS Here

Top 3 Fat Burning Supplements
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I was looking at instant knockout and it over all seems to have been received pretty well. I see that the number one side effect seems to be due to caffeine (I drink coffee a lot so that shouldn't be a problem) But is there any other known side effects? Also is there HGH found within this product? -Joe


You're right, Instant Knockout is a great fat burner, and it does have quite a bit of caffeine. I haven't heard of any other side effects besides those related to caffeine, so you should be fine there.  There's no HGH in Instant Knockout. To my knowledge, no supplement contains HGH. Some claim to stimulate the body to release increased HGH, but Instant Knockout is not one of those.- Rob

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What fat burner would you recommend based on your knowledge of how they work if I'm needing to lose 30 lbs but currently have a fracture in my lower left leg and am unable to do cardio? I'm thinking between the top 2 you rated one works better with excercise. I'm looking for one that will help me burn fat while I'm unable to do my normal exercise routine. Thanks for your help! -Marie


I would still recommend Instant Knockout for you, but even with a good supplement, it's tough to lose fat without any exercise at all.- Rob

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52 yr old female. Have always been in shape until the dreaded Menopause Monster hit. Now I *Have no motivation or energy to workout *gained 30 lbs mostly around my belly *lost a lot of muscle with weakness. I would like to lose belly/body fat,lose weight, regain motivation and regain muscle I have lost. I have the want and desire to workout but, cant seem to find the energy. Any suggestions? -valerie


First off, sign up for my weight loss ebook for food and workout help.  When it comes to supplements, check out Instant Knockout. It's a great fat burner with appetite suppression. It's also got a lot of caffeine for energy to help you get motivated to work out.- Rob

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Can you take the keto os and the phen 375 together? 2. Will either effect hypothyroidism? I have 40 lbs of fat to loose. -Lynne


I wouldn't recommend taking them both together. They both contain stimulants, so together, you might be overstimulated. One possibility is to one for a while - as long as it's working, then switch to the other to change things up once you hit a plateau.- Rob

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what about dura last 30 for sex power? -joy


Duralast is a prescription medication to help prevent premature ejaculation. If you think you'd be a candidate, ask for a consult with your doctor.- Rob

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Is phen 375 safe to take? Are there any ingredients that can harm you? -Hector Flores


Phen375 is generally safe. There's a possibility you might get side effects with Citrus Aurantium (Synephrine), but that would be it.- Rob

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Is Phen375 the same thing as Phenfen? I was furious when Phenfen was pulled. It was the ONLY weight loss/fat loss pill that ever worked 100% on me...even now! The lbs. and fat dropped off. Of course, the lbs. have returned since this product was pulled. Wasn't Phenfen by RX only! I know I was going to the doctor because, at that time, I was considered to be morbidly obese. Now, I need to lose 33 more lbs. and KEEP it off! Phenfen did all that for me. Where is it...I need it now? Is Phen375 the replacement for Phenfen or is this the real-meal-deal? -Diane


Phen375 is not Fen Phen. Fen Phen is no longer around, but your doctor can still prescribe Phentermine for you, which is part of what Fen Phen was.  Phen375 is a dietary supplement that works like Phentermine.- Rob

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Can Instant Knockout and Phen375 be purchased at GNC. -Brendan


Nope. They're only available online through their respective websites:  Instant Knockout and Phen375.- Rob

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can you take testofuel with instant knock out ? -brad


You can. It's a great stack for weight loss and muscle tone.- Rob

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I just got a magazine in the mail raving about a weight loss pill called Green Coffee Thin 850 mg. Susan Williams Clinical Director. Studies performed at Harvard, John Hopkins and national Yang-Ming University also thumbs up from Dr. Oz. claims you lose 2 lbs daily without changing your eating habits or exercise. I wanted to consult with you before purchasing. -Marie


I haven't tried or looked into it myself, but it looks like it's got only one ingredient - CGA - which you could probably get at a cheaper price if you looked around.- Rob

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So Im a little curious, i dont workout like most people do but i do work a job that feels like a constant workout, im constantly moving and lifting heavy objects all day long. Would the instant knockout work for me, im just wondering because ive never had the determination to keep to a workout routine and with the way my job was. Any advice? -daniel


It will still help you with energy, appetite suppression, and fat burning, but you'll get best results with a good meal and workout plan.- Rob

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Have you heard of a group called superman herbs? IF so what do you think of them? -George


I hadn't heard of them. I just took a quick look at their website. It says they're out of stock in several products.  They may be going through some some growing pains.- Rob

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I'm 44 and I'm on Pravastatin for cholesterol. Since this medicine is processed by the liver, I'm just wondering if anything in Instant Knockout would add further stress to the liver. I really want to get rid of the belly fat this year. Just want to make sure this is a safe supplement for me. -Bill


I don't see an issue, but you should check with your doctor. He or she is the one with the knowledge and expertise you need in this case.- Rob

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Fisrt I would like to say I like your site. I work a lot, try to work out at least 4 times a week if I can my question is: Is there any fat burning products that are in powder form that have the least side effects? I was reading about the phen375 but you only mentioned pills I'm one of those people that can not take pills but would like to get rid of some stubborn fat. -Diane


Check out https://www.supplementcritique.com/transparent-labs-stim-free-pre-workout-review/  It's a pre workout, but will works as a fat burner/weight loss product as well.- Rob

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What critique do you have of Advocare products? -John


We've got a review posted for Thermoplus. Here's a link: https://www.supplementcritique.com/advocare-thermoplus-review/- Rob

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Have you heard of a supplement called ArthroCure? It is distributed in Australia by a company called Greenstay in Alexandria NSW. It claims to cure arthritis. Contains White Willow Bark, Silicon, Horsetail, Wintergreen, Devil's Claw and Boswelia. -Jo Schembri


I haven't heard of it. I did a quick search and didn't come up with anything. Do you have a link?- Rob

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looking at instant knockout how would it react to a enlarged prostate -Paul


It's got quite a bit of caffeine, which is known to potentially make symptoms of BPH worse. You may want to check in with your doctor about what to take to help with weight loss.- Rob

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hi there, i have been looking for some weight loss supplement , that can be really helpful to shed some extra weight without causing serious side effects. I am suffering from alopecia areata (auto-immune disease) from one year. i did took medication last year which recovered my alopecia but then it started appearing again two months before , though i am not taking any other medication for now. I ordered phenq , a weight loss supplement with really good reviews. I took it for two days but suffered few side effects. i would like to know that can i take weight loss supplement with alopecia condition, as phenq labels says not to use their product if somebody have auto-immune disease. if yes, then which one will be the best. Looking forward to your response. thanks, simran -Simran


When you have a medical condition, and/or take medications, you'll need to discuss with your doctor which supplements or supplement ingredients are safe and not safe to take.- Rob

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I was reading about the elite 350 supplements and was very Interested in your article. Thankfully I did not go ahead with the purchase. I have tried other fat burning supplements with out any success. I'm 64 years old, 85 kgs and 175 cm tall. i wish to lose some body fat, especially around my belly and achieve better fitness. I try to get to the gym at least once or twice a week for general fitness. Do the above 3 supplements have any affect on the liver or kidneys? Regards George -George


No issues with liver or kidneys. They're all natural, and have very few to no side effects. Think headaches or nausea if anything.- Rob

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Have you done your critique or review of C. Mukul Complex? Their brochure makes losing fat so easy. -Frank


I haven't had a chance yet.- Rob

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Author: Rob Miller

Supplement Critique

Rob Miller founded SupplementCritique.com over 7 years ago, and has been the chief editor ever since. He has a diploma in Advanced Dietary Supplements Advisor, and worked at GNC for 3 years. He KNOWS supplements, both inside and out. Rob currently resides in Jupiter, FL, with his wife of 4 years.  Learn more about him in his Bio here. Follow him on Twitter , Facebook, LinkedIn, or find him on Google +.