Fat Burner & Weight loss

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Fat burners are supplements designed to sit alongside a calorie-controlled diet and regular training. Most are thermogenic formulas built around caffeine, while stim-free options use ingredients such as L-carnitine or CLA. This range includes powders, capsules and liquids from EHP Labs, Nutrex Research, Redcon1, Primabolics and Universal Nutrition.

Read the Fat Burner & Weight loss buying guide
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Fat Burner & Weight loss: buying guide

What a fat burner can and cannot do

Set expectations first. The International Society of Sports Nutrition (ISSN) position stand on diets and body composition states that fat loss is driven by a sustained calorie deficit. The US National Institutes of Health Office of Dietary Supplements (NIH ODS) goes further: there is little scientific evidence that weight-loss supplements work, and their makers rarely test them in people.

That does not make every ingredient useless. The NIH ODS says caffeine may cause a little weight loss or less weight gain, although tolerance can reduce the effect over time. In practice, a caffeinated fat burner delivers a measured dose of caffeine, so treat it like one. Weight management still depends on your overall diet and activity.

Common ingredients and what the evidence says

The NIH ODS has reviewed the ingredients most often found in weight-loss products. Here is how it rates the ones you will see on our shelves.

Ingredient What the evidence says Watch for
Caffeine (also guarana, green coffee) May cause a little weight loss; tolerance builds Nausea and rapid heartbeat at high doses
Green tea extract Might cause a small weight loss Liver damage has been reported in some people
L-carnitine Might cause a small weight loss Nausea, diarrhoea, fishy body odour
CLA Might cause a very small loss of weight and fat Stomach upset, diarrhoea or constipation
Garcinia cambogia Little to no effect on weight Headache, nausea, gut symptoms

The Australian Institute of Sport (AIS) is more cautious about L-carnitine, saying there is a lack of evidence that it enhances fat loss. If you want a single stim-free ingredient, see our L-carnitine and CLA ranges.

Stim or stim-free, powder or capsule

  • Stimulant thermogenics contain caffeine and often other stimulant ingredients. They are the most common type in this range.
  • Stim-free formulas leave out caffeine and use ingredients such as L-carnitine or CLA. Check the label to confirm there is no caffeine from any source.
  • Powders mix into a flavoured drink, capsules are simple to dose and carry, and liquids are mostly carnitine products. The AIS notes liquid carnitine forms are generally unresearched and rarely reach the doses used in studies.

If you already use a pre-workout, add up the caffeine in both before taking a thermogenic on the same day. Many people choose one or the other.

How to compare fat burners on the shelf

  • Caffeine per serve. Look for a clear milligram figure. The NIH ODS says intakes of up to 400 to 500 mg a day seem safe for most adults, and coffee, energy drinks and pre-workouts all count towards that.
  • Full disclosure. A label that lists the amount of each ingredient lets you compare it with research doses. The NIH ODS notes that most ingredient combinations have not been studied, so their combined effects are unknown.
  • Ingredients to treat with caution. The NIH ODS says bitter orange (synephrine) and yohimbe might not be safe, with effects that can include a faster heart rate and higher blood pressure.
  • Price per serve. Divide the price by the number of serves, as serve sizes vary widely between brands.
  • Drug testing. The AIS places stimulants in Group D of its framework: banned or at high risk of contamination with substances that could lead to a positive test. Athletes who are drug tested should choose batch-tested products (for example HASTA or Informed Sport certified) and check with their sport.

How to use a fat burner

Follow the label, including the maximum daily serve. Take stimulant products early enough that they do not affect your sleep, and do not double up with other caffeine. Keep protein high: the ISSN notes higher protein intakes have satiating effects and help preserve lean mass during a calorie deficit, which is where a whey protein isolate can help. Our fat burner tips and how to lose weight pages cover the basics.

Safety and who should check with a doctor first

  • These products are for healthy adults. If you have a heart condition, high blood pressure or anxiety, or take regular medication, speak to your doctor before using any fat burner.
  • Avoid stimulant products if you are pregnant, breastfeeding, under 18 or sensitive to caffeine. FSANZ requires energy drinks to carry a warning that they are not suitable for young children, pregnant or lactating women and people sensitive to caffeine, and the same groups should take care with concentrated caffeine products.
  • Buy from a reputable retailer. The NIH ODS warns that some weight-loss products have been found to contain prescription drugs or controlled substances that are not listed on the label.
  • Stop and seek medical advice if you notice a racing heart, chest pain, or signs such as yellowing skin or dark urine.

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Related categories

Browse appetite control and metabolism supplements, or learn more about the main active ingredient in our page on what caffeine is.

Sources: NIH ODS: Dietary supplements for weight loss; ISSN Position Stand: diets and body composition; AIS Sports Supplement Framework: Carnitine.

Order online with Australia-wide delivery, free on orders of $100 or more, or visit a Supps247 store in Melbourne, regional Victoria or Brisbane to compare products in person before you buy. Members can use our price match guarantee on full-priced items.

Always read the label and follow the directions for use. If you have a medical condition, are pregnant or take regular medication, check with your doctor first.

Fat Burner & Weight loss: questions and answers

Do fat burners actually work?
Not on their own. The NIH Office of Dietary Supplements says there is little scientific evidence that weight-loss supplements work, and the ISSN states that fat loss is driven by a sustained calorie deficit. Caffeine may cause a little weight loss, but results mostly come from your diet, training and consistency. Think of a fat burner as a small extra, not the plan.
Can I take a fat burner with pre-workout?
Be careful. Most thermogenic fat burners and most pre-workouts both contain caffeine, so taking both can push you past a sensible daily intake. Add up the caffeine on both labels, plus coffee and energy drinks. The NIH ODS says up to 400 to 500 mg a day seems safe for most adults. Many people simply choose one product on training days.
Are there stimulant-free fat burners?
Yes. Stim-free products leave out caffeine and usually rely on ingredients such as L-carnitine or CLA. Examples in this range include OxyShred Non-Stim, Redcon1 Silencer and CLA softgels. Evidence for these ingredients is modest: the NIH ODS rates carnitine and CLA as causing a small or very small loss at most. Always check the label to confirm there is no caffeine.
How much caffeine is too much?
The NIH Office of Dietary Supplements says intakes of up to 400 to 500 mg a day seem safe for most adults, and that higher doses can cause nausea and a rapid heartbeat. FSANZ notes there is no official safe limit in Australia. Count every source, including coffee, energy drinks and pre-workouts, and take less if you are sensitive to caffeine.
Does L-carnitine burn fat?
The evidence is weak. The AIS says there is a lack of evidence that carnitine enhances fat loss, and that taking it for four weeks or less does not raise muscle carnitine levels. The NIH ODS says it might cause a small weight loss. Carnitine is stimulant free, which is why some people use it, but expectations should be modest.
Is green tea extract safe?
Drinking green tea is safe for most people, but concentrated extracts are different. The NIH Office of Dietary Supplements says green tea extract might cause a small weight loss and that liver damage has been reported in some people who took it. Follow the label, do not combine several products that contain it, and stop if you notice symptoms such as dark urine or yellowing skin.
Do fat burners stop working over time?
The caffeine in them can. The NIH Office of Dietary Supplements notes that people develop tolerance to caffeine, which can reduce its effect over time. Increasing the dose to chase the same feeling raises the risk of side effects, so stick to the label. Progress over time still depends on maintaining a calorie deficit and training consistently.
Are fat burners safe for drug-tested athletes?
They carry a higher risk. The AIS places stimulants in Group D of its supplement framework, meaning banned or at high risk of contamination with substances that could cause a positive test. Multi-ingredient products add to that risk. If you are drug tested, choose batch-tested products, for example HASTA or Informed Sport certified, and check with your sport before using any fat burner.

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