Top 5 Best Fat Burner Supplements 2023


Quin Candy is reader-supported. When you buy through our links, we may earn an affiliate commission. Learn more here.

Looking to trim down and retain hard-earned muscle? Here’s our top 5 fat burners list (now updated for 2023)! If you already aren’t familiar with them, so-called fat burners are food supplements that help support the loss of weight by raising metabolism, reducing cravings, and helping the body use more fat as fuel.

Our top fat burners have all been thoroughly reviewed to ensure they’re clear of any risky or synthetic ingredients. We base our list on:

  • Excellent reviews online
  • 100% safe and clinically researched formula
  • Metabolism boost
  • Appetite reduction
  • Long-term safety
  • Company trust

The following fat burners also have the ability to optimize your workouts by boosting energy and focus, which can be useful during caloric restriction.

In the past year alone, we’ve researched the ingredients in over 35 most popular fat-burning supplements. Note that we haven’t personally used these supplements; instead, we’ve done an analysis of their formulas to get an accurate picture of their effectiveness and safety.

The result of our search has allowed us to present the top 5 fat burners we’ve come across on the internet.

Instant Knockout

• 100% natural with no fillers

 • Endorsed by pro athletes and trainers
• Bulk-buy deals

• Muscle protecting for toning

• Helps burn fat as part of a healthy lifestyle

• Excellent reviews
• Website:

Hunter Burn

• Maximum impact formula

• Made with premium thermogenics
• Strong hunger control
• Natural, clinically backed ingredients
• Bigger dosed for faster results - 180 cap/bottle 

• Luxury brand

• Website:


• Pure CBD isolate

• Works to enhance your training
• cGMP approved and safety inspected

• Supports appetite control
• May improve sleep quality
• Website:

Burn Lab Pro

• The best stim-free fat burner

• 100% transparent
• Used by #1 Ranked UFC Bantamweight Athlete
• Natural and thoroughly researched

• Website:

Fighters Core

• Award-winning formula

• Boosts metabolism for higher calorie burn
• Backed by academic research
• 100% natural
• Website:

#1 Instant Knockout – Best Overall

“The best thermogenic fat burner. Completely safe and natural with fast results according to many customers.

Instant Knockout CUT

Instant Knockout is an innovative, awesome-looking fat-burning supplement that can help you shred weight relatively fast. It was originally developed for MMA fighters by Roar Ambition, a specialist company based in the UK but operating worldwide.

This product boasts excellent reviews and some of the best ratings out of any fat burner. Both men and women have been using IKO CUT to get leaner and keep the weight off in a safe and sustainable way.

Effects that make Instant Knockout the best thermogenic:

  • Potential fat loss results in 5-6 weeks
  • No hunger cravings
  • Preserves lean muscle tissue
  • Maintains high energy levels and focus during the day

Ever since its release in 2012, Instant Knockout’s makers have constantly talked with nutritionists and pro athletes to keep the ingredient formula updated.

Instant Knockout gets updated every few years, based on the latest scientific findings.

We like this – it tells us we aren’t getting a product that lives on its past glory, but one that’s arguably still number 1 after all these years.

See Instant Knockout for yourself here:

Instant Knockout Results

We can understand why cutting weight with IKO is surprisingly smooth and feels easy for many customers. Studies show that ingredients in Instant Knockout such as caffeine start working almost immediately.

The first change you should notice is a reduction in the appetite, followed by a stable clean source of energy that should last you throughout the day, even if you’re low on calories. This is thanks to the smart combination of several ingredients, including caffeine and l-theanine.

After about 3 weeks you may start to see the first noticeable changes in your physique and around the belly, provided you watch your diet and exercise regularly.

This is the fastest fat burner on this list in our opinion.

After those initial 3 weeks, your results might slow down a bit, especially if you have slip-ups here and there (we all do, we’re human). That said, if you keep going for 2-3 months with this product and a clean lifestyle, you’ll see some pretty impressive differences in your physique compared with when you started.

One drawback is that it’s only available directly from the manufacturer’s website, and the price is a bit high, but it’s kind of expected from a product of this quality.

The high-dose green tea extract in Instant Knockout is healthy for most people, but we don’t recommend it for those with liver conditions as green tea extract can lead to side effects in rare cases.

Four capsules per day might seem annoying as well, but keep in mind that this will prolong the fat-burning effects throughout the entire day, meaning you won’t have any ‘downtime’ in effects between doses.

Jeremy Instant Knockout Testimonial
Three months cutting with IKO, 3 days a week training, and a fairly clean diet.

See more Instant Knockout Testimonials here:

The Good:

  • 10 healthy and all-natural ingredients
  • Provides long-lasting, clean energy
  • Effective fat burning
  • Suppresses cravings
  • No hidden ingredients or proprietary blends
  • Large discounts when you buy in bulk
  • Available worldwide
  • Excellent reviews – used by Pro MMA athletes and coaches

The Bad:

  • Premium price when buying just 1 box
  • Only sells directly from Instant Knockout’s website
  • Not for those with extreme caffeine sensitivity

Visit Their Website:

#2 Hunter Burn – The High-Dosed Fat Burner for Faster Results

A high-end scientific fat burner specifically designed for men over 35.

Hunter Burn Fat Burner

Hunter Burn is a highly targeted fat burner that caters to a specific audience – premium, high-achieving men who need a supplement that will help them feel good and look great.

If you’re looking for a fat burner that delivers some of the industry-leading ingredients in large clinical doses, then get your hands on a supply of Hunter Burn.

It contains a generous amount of white kidney bean, matcha tea, and vitamin D3 to support muscle-building, performance, and fat burning.

While it comes at a premium price tag, Hunter Burn doesn’t compromise in any department.

It works to help you:

  • Improve daily mood and mental sharpness
  • Target stored fat with matcha tea
  • Activate thermogenesis with Cayenne
  • Suppress cravings with white kidney bean
  • Support immunity with vitamin D

Our Thoughts on Hunter Burn

This is a product with a tried and tested formula. You should experience a lift in focus, mood, and energy levels shortly after taking Hunter Burn.

The first visible improvements with fat burners like Hunter Burn should come after 4 weeks of use. We think combining it with calorie deficit and regular exercise will work extremely well. You should experience a boost in energy levels and focus almost right away.

Burn by Hunter Evolve - Our Bottle

Effects you can expect over 1 month:

  • A good amount of daily energy, without the jitters
  • More motivated to hit the gym, and better performance with weights
  • Better quality sleep
  • Improved ability to sustain focus and deep work
  • Solid weight loss results (comparable to Instant Knockout)

While unexpected, some users may also notice an increase in libido, thanks to vitamin D. When you think about it, this is not really a surprise – about 1 billion people worldwide are deficient in the sunshine vitamin. One of the symptoms is diminished sex drive.

Some people might try to combine Hunter Burn With ShredCBD. While obviously expensive, this combination can give a more pronounced effect in reducing stress levels and improving sleep, which can benefit your weight loss in the long run.

The only complaint we have about Hunter Burn is the price. We understand that it’s made to deliver maximum quality, but some folks might want a cheaper option. With that said, Hunter Burn is worth the money if you can afford it.

The Good:

  • 6 potent and high-quality ingredients for maximum benefit
  • Generous dosages (5000IU of vitamin D3)
  • Scientifically backed
  • 180 capsules per bottle
  • 90-Day Guarantee

The Bad:

  • Expensive
  • Only found on the Hunter Revolve Website

Visit Website:

#3 ShredCBD – The Best CBD-Based Fat Burner

shred cbd number 1 fat burner

ShredCBD is an effective, side-effect-free solution to burning unwanted fat and feeling leaner. CBD plays a crucial role in your body’s endocannabinoid system (ECS). Which is why supplementation works so well. It’s completely different from any other product on offer right now.

According to some early studies, CBD is suggested to help you shred down in 5 different ways:

  • Triggers fat ‘browning’ to help the body use fat as fuel
  • Promotes insulin sensitivity to prevent weight gain
  • Significantly reduces cortisol, a stress hormone linked to fat accumulation
  • Improves mood and sleep quality
  • Interacts with the brain’s ECS receptors to influence appetite and reduce calorie consumption

CBD in ShredCBD comes as pure hemp isolate, meaning it’s under 0.1% THC, non-psychoactive (doesn’t make you high), and completely legal in the USA.

Green tea and Garcinia Cambogia are added to augment the fat oxidation effects of CBD. The downside is that they’re dosed fairly low so we wouldn’t expect much from these in terms of direct fat burning.

While CBD is still not as researched as other weight loss compounds like caffeine, it shows promise in regards to helping with sleep, reducing stress, and other general health benefits. So if you aren’t looking strictly just for fat burning but for mental benefits too, ShredCBD is worth looking into.


This is a high-grade supplement that even after a couple of days should lead to apparent changes in focus, mood and appetite.

In terms of weight loss, there is a possibility you might see results after about 30 days, especially if you use ShredCBD’s power to exercise and focus on a whole-food diet.

Obviously, we’re all very different so there’s no guarantee how a supplement will work for you until you try it yourself. That said, effects you might see over 2-5 weeks of using ShredCBD:

  • Reduced appetite
  • More energy
  • Better sleep and focus

ShredCBD has no dodgy stimulants in it either, so there’s no risk of side effects or insomnia.

The Good

  • A potent 40mg of pure CBD Isolate per day (1200mg in the whole bottle).
  • CBD alone can potentially deliver more benefits than some fat-burner ingredient blends.
  • Free Fast Shipping across the USA.
  • Free 24-page weight loss e-book (apparently worth $10).

The Bad

  • Only available in the USA
  • Premium price due to the high manufacturing cost of CBD isolate
  • You can only get it directly on the official website
  • Garcinia and Green Tea Extract come in a low-dosed proprietary blend

Visit Their Website:

#4 Burn Lab Pro® – Best Stim-Free Fat Burner

Extremely clean, standardized formula with some of the most effective ingredients on the market.

Burn Lab Pro’s patented, stim-free formula is extremely light, yet it’s so effective at burning fat that it can rival any caffeine-based weight loss pill.

Free of caffeine, GMOs, cheap ingredients, fillers, or harmful chemicals of any kind.

In our opinion, Burn Lab Pro is the best fat burner if you don’t like the effects of stimulants and want something lighter for long-term fat loss support.

Don’t get us wrong; other fat burners are higher on this list for a reason – they have better ingredients for burning fat faster in our opinion. However, if you want cleaner effects without caffeine sensitivity issues, get your hands on a supply of Burn Lab Pro.

The ingredients

Burn Lab Pro’s vitamins and minerals are cultured on probiotic bacteria and yeast using the unrivaled NutriGenesis® nutrition technology. This, according to Burn Lab Pro’s makers, creates a “food-identical” nutrient with all of its essential cofactors – making it easy for your body to absorb and utilize.

Burn Lab Pro contains the essential trace mineral Chromium, which will regulate your blood sugar levels and curb cravings. Cayenne pepper is a fiery spice that will kickstart your metabolism and make you burn more fat as a result.

You can see the ingredients and their relevant clinical research on Burn Lab Pro’s website here:

Dosage, price, and final thoughts

Dosage instructions: 3 capsules spread evenly throughout the day, with a full glass of water (with or without food).

Burn Lab Pro uses patented ingredients, and so it naturally costs more than some of its competitors – $59 per month’s supply.

However, buying the 3-month supply package gets you 1 extra bottle of Burn Lab Pro for free as well as free worldwide shipping. Breaking it down, Burn Lab Pro costs only $1.48 per day when you buy the 3-month package.

According to people at Opti-Nutra, Burn Lab Pro is perfect for those who exercise on an empty stomach, also known as ‘fasted’ training. With 90 capsules per bottle, you’re getting a continuous supply of fat-burning ingredients to ensure the best results. If you can afford it, Burn Lab Pro is worth trying.

Visit Burn Lab Pro’s Website:

#5 Fighter’s Core – Athlete’s Favorite

We said; The best fat burner for protecting muscle on a calorie deficit.

Developed in late 2020, Fighter’s Core is a fat burner from specialists at PFX Labs. It’s designed for 30-day Pro-cut and consists of 8 highly focused weight loss ingredients.

Fighter’s Core works by:

  • Blocking enzymes that break down muscle tissue – maximize ROI from your dieting and training
  • Increasing muscle protein synthesis – more muscle, faster metabolic rate
  • Stimulate energy production – directly through caffeine and also by optimizing your mitochondrial cells
  • Naturally promotes hormonal balance in the body – less of the stress hormone cortisol, more of the androgen hormone testosterone

Dosage instructions: 3 capsules spread evenly throughout the day, with or without food.

Who is Fighter’s Core for?

Preventing muscle loss while cutting weight can be a daunting task for any athlete, let alone a natural bodybuilder.

If you’re someone who needs to make sure you retain as much muscle as naturally possible, then look no further than Fighters Core. This supplement is specifically designed for athletes who want to get the most from their diet and training.


The entire ingredient profile of Fighter’s Core is transparent; you won’t find any proprietary blends or other marketing gimmicks on the label. It’s also a clean formula that’s manufactured in the USA in cGMP approved facilities.

Featuring the likes of HMB calcium which protects muscle tissue from breakdown, Forskolin which increases the body’s innate fat-burning molecule cAMP, and Theacrine to boost your mental focus and reduce cravings, Fighter’s Core has really nailed it when it comes to tackling weight loss from different angles.

Fighter’s Core also has plenty of caffeine anhydrous, which, unless you’re very sensitive to it, is a great way to maximize your energy levels.

Price and final thoughts

Fighters Core costs $49 per month’s supply, but you can get solid discounts when buying multiple bottles. We appreciate it’s pretty expensive, which is one of the few downsides of this supplement and the reason why it didn’t make it higher on this list.

That said, Fighter’s Core is the winner of Generation Iron’s 2020 Supplement Awards in the fat burner category, and continues to be a serious contender for the best weight loss supplement on our list even now in 2023.

Visit Fighter’s Core Website:

Our Conclusion

We tested, rated and ranked our top 5 fat burners carefully based on criteria such as:

  • Clinical evidence in terms of their ingredients
  • Potency of the ingredients according to studies
  • Safety

We recommend ShredCBD for men and women who like stim-free products and want other benefits to their daily life in addition to weight loss. Such as improved sleep and better mood.

Instant Knockout is our #1 thermogenic supplement for focus, energy and fat burning in a natural way without causing side effects. Though you should avoid it if you are intolerant to caffeine and other stimulants.

We recommend the top product, but generally speaking, all of them can deliver you the results you’re after.

Click to read my ShredCBD Review!




  1. Hi, I just read your article and it was a great read! I actually ended up ordering the Hunter Revolution Burn and the Shred CBD to combine them as you mentioned. My question is did you take them both as suggested or did you adjust it?

    • Hi Theodore,

      Thank you. We’d go with taking both supplements according to the manufacturer’s recommendations. So 1 capsule, twice per day for ShredCBD, and 2 capsules three times per day for Hunter Burn. If you have caffeine sensitivity, then 2 capsules of Hunter Burn, once per day is optimal.

    • Debby,

      That is a question only your doctor can answer. We don’t recommend taking any supplements when you have a condition before speaking to a qualified medical professional first.

      That said, all of the supplements in this guide contain ingredients that you will often naturally find in foods (albeit at more concentrated doses). These ingredients are thoroughly tested & researched for side effects and are known to be safe for most people.

      Hope that helps!

  2. Hello there.

    How long are these fat burners meant to be taken for?

    Once I reach my goal should I stop taking them, or do I need to keep on taking them to maintain the results, or even just as a supplement?

    • Hi Armando,

      You do not need to keep taking these fat burners to maintain your results. Once you reach your weight goal you can stop taking them, they don’t cause dependence.

      That said, the supplements that we’ve featured on this list do help you with maintaining results as they keep you burning an increased amount of body fat along with curbing appetite. Plus, all of our featured supplements consist of ingredients that are extensively researched and safe to take daily long-term.

      Hope that helps.

    • Hi Suzy,

      In your case, we would go with either ShredCBD or Burn Lab Pro. Both are safe, natural, well-dosed, and don’t cause dependency. That said, both have their pros and cons.

      ShredCBD is better if you want to improve your sleep, mood, and overall fitness, not just weight loss. Burn Lab Pro is more focused on weight loss specifically, along with toning and protecting your muscles from a calorie deficit.

  3. Which is best for me? I’m trying to lose some fat, gain some energy/strength/endurance. I’m trying to gain lean muscle. I workout & run. Trying to clean up my diet a bit better. Thx

Leave a Reply

Your email address will not be published.