Fat burners

We group every fat burner on our shelf by what sits on the ingredients panel – caffeine sources, green tea extract or L-carnitine – so you shop by composition and stimulant tolerance, not the name on the tub. Pick stimulant or stimulant-free, in tablets, capsules, liquids or powders. Match a formula to your caffeine tolerance below!

What “fat burner” supplements contain

“Fat burner” is a shelf category name, not a description of what a product does. The supplements here usually combine caffeine sources and green tea extract, often L-carnitine, plus extras like chromium, choline or B vitamins. They come as fat burner tablets, capsules or liquids, and formulas vary widely – read the ingredients list, not the front.

Browse fat burners by type

We split our fat burners into three types, and the quickest way to narrow it down is your view on stimulants.

Caffeine-based (thermogenic) formulas

A thermogenic fat burner is the stimulant-led type, built around caffeine and botanicals such as guarana or green tea extract. Caffeine adds up fast, so watch the total: for most healthy adults, up to 400 mg a day and 200 mg in one serving is widely considered safe, dropping to 200 mg a day in pregnancy.

L-carnitine

L-carnitine is a single, stimulant-free ingredient rather than a blend. In the body, carnitine helps carry fatty acids into the mitochondria – background on the ingredient, not a promise about any product, and the supplement evidence is modest and mixed. It sits at the far end of the shelf from a mass gainer, a high-calorie powder for when food alone falls short.

Stimulant-free formulas

A stimulant-free fat burner leaves out caffeine and other stimulant botanicals, so it suits anyone sensitive to stimulants, training late, or near their daily caffeine limit. Still check the dose and any contraindications.

How to read a fat burner label (ingredients & dosage)

The label tells you more than the front of the pack, so read it before comparing on price. Start with the serving size – how many capsules make a dose, and how many doses come in the pack – then add up the caffeine total from every source, including guarana, kola nut and green tea. Note the recommended daily intake, the stated amount with a warning not to exceed it, and scan allergens and suitability: vegan, gluten-free and “may contain” lines plus listing icons, alongside warnings for pregnancy, medication, conditions and keeping the product from children. That reading habit carries to our protein bars too, where you weigh protein against sugar the same way.

Using supplements alongside diet and training

Fat burners are one part of a routine where diet and training do the heavy lifting – used around your meals and sessions, not in place of them. Food supplements should support a varied diet, not replace it, so how you eat and train across the week sets the pace. If a handy snack keeps you consistent, our healthy bars sit in the same line-up. Match a formula to how you train, and let the label guide the rest.

Frequently asked questions about fat burners

What ingredients are in fat burner supplements?

Ingredient panels often include a “proprietary blend” line, grouping stimulants under one combined figure instead of listing each amount separately. That makes similar-looking panels hard to compare, so check the caffeine total per serving rather than the label order.

What is the difference between thermogenics and l-carnitine?

The practical difference comes down to stimulant tolerance and training time. A thermogenic suits an earlier session if you handle caffeine well. L-carnitine suits evening training or a day you would rather skip stimulants.

Are there caffeine-free fat burners?

Yes, though caffeine-free does not mean free of other active ingredients. Some blends still include non-stimulant actives, so check the full label rather than assume “stimulant-free” covers everything.

How and when do you take fat burners?

Follow the pack: take the stated capsules or tablets at the suggested times, and never exceed the recommended daily intake. Keep stimulant formulas to earlier in the day so caffeine does not disturb sleep.