What supplements should I take when working out to lose weight?

Nothing sold burns fat, so a supplement has three jobs in a deficit: the deficit's arithmetic, the first job of protecting the muscle with protein and creatine, and the second of protecting the session with caffeine

What supplements should I take when working out to lose weight is a question that is answered honestly only after one sentence that the shelf never prints: nothing sold burns fat, and the deficit does that. Fat is lost when energy intake sits below expenditure over a sustained period, a few hundred calories a day below maintenance measured by the scale's trend over a block rather than by any single weigh-in, and where on the body it is lost is set by genetics and sex rather than by any product or exercise. The training's part is to keep the muscle while the fat goes, so that the person who arrives at the target weight is the same person with less fat rather than a smaller person with less of everything, and a supplement's part is narrower still: it protects what the deficit puts at risk. There are three things at risk, which gives a supplement three jobs, and the shelf's fourth job, burning the fat itself, does not exist.

The first job is protecting the muscle, and it has two products. A body in a deficit takes some of its energy from muscle unless the muscle is being used and fed, and the research on fat loss with resistance training finds that protein at around 1.6g per kilogram of body weight a day, spread across three or four meals and kept toward the top of the range when the deficit is larger, holds lean mass through the deficit, while most people cutting eat well below it; the protein comes from food first, since protein-rich food is the most filling thing on a deficit plate, and from a powder for the days the plate falls short. Creatine at 3 to 5g a day is the second product, with evidence for holding lean mass through a deficit when combined with lifting, by keeping the sessions productive at a time when energy is short; its first kilogram of intramuscular water goes the wrong way on the scale and is ignored in favour of the trend, and a person who stops it to see a lower number has traded a kilogram of water for a worse block.

The second job is protecting the session, because a deficit makes training harder and the sessions are what keep the muscle. Caffeine at 3 to 6mg per kilogram as a tablet about an hour before the sessions that matter lowers perceived effort and keeps the work in the session up, with a small rise in expenditure and a small fall in appetite on the side, which are the only fat-loss effects any legal product has and are not the reason to take it; it is kept for the sessions that matter rather than every one, because tolerance blunts it and because a deficit already costs sleep, which the next section covers, and a late caffeine dose costs more. The pre-workout blends deliver the same caffeine with an undeclared stimulant stack at a higher price and are not the second job's product.

An arithmetic and two jobs filled by three products, and the third job, the plate, the fat burners placed by what they do, the sleep a deficit worsens, and the worked example, which is the next section.

The third job, protecting the plate's micronutrients: vitamin D, iron on a test and the mineral a smaller plate loses; the fat burners placed by their results; the sleep a deficit worsens; the worked example on the third job; and the verdict

The third job is protecting the plate, and it is the one the shelf never names because it sells nothing exciting. A deficit is eaten as a smaller plate, and a smaller plate carries fewer micronutrients, so that the shortfalls the national survey finds in a share of adults eating normally become more likely in a person eating less; the job is to close the ones that matter without a formula that closes none. Vitamin D through the UK winter is taken by everyone and especially by a person cutting indoors from October to March, at a few pence, with its claims for muscle function and the immune system. Iron is the second, and it is a test before a tub: a woman cutting on a plate low in red meat while periods continue is the person most likely to run her stores down, and a ferritin test from a doctor decides whether iron is taken and at what dose, because flat sessions and heavy legs in a deficit are blamed on the deficit when they may be the iron. The third is the mineral a smaller plate loses most easily, magnesium, which comes from the leafy greens, nuts, seeds, wholegrains and pulses that a person cutting carbohydrate and calories often cuts first, and which has authorised claims for normal muscle function, normal energy-yielding metabolism and the reduction of tiredness and fatigue; a person whose deficit plate has lost those foods takes it for the plate. A multivitamin at a habit dose closes none of the three to a useful level, and the three lines bought as three lines cost less.

The fat burners are placed by their results, which are the fourth job's whole case. The stimulant blends, the green tea and coffee extracts, carnitine, conjugated linoleic acid, chromium, raspberry ketones and the formulas built from them have trials, in people already in a deficit, showing weight differences measured in grams over months, at a stimulant load that raises heart rate and blood pressure and at a price in pounds a day; the one ingredient that does anything measurable is caffeine, already in the second job as a penny tablet. A person who buys a fat burner has paid pounds for the smallest term in the arithmetic and bought a stimulant load into a body already short of sleep, and the prescription weight-loss medicines that do have large effects are a doctor's conversation for the person whose weight is a health matter, with the first two jobs mattering more alongside them because the muscle leak runs faster on an appetite that has been reduced.

Sleep belongs on a page about a deficit because a deficit worsens it and it worsens the deficit back. Hunger raises arousal at night, short sleep raises hunger the next day and lowers the training quality that protects the muscle, and the two together are the mechanism by which a cut stalls in its later part; the sleep is protected by the behavioural inputs, light, a consistent wake time, caffeine kept early and alcohol kept out, and not by a product, and a person whose cut has stalled checks the sleep before the shelf.

The worked example is placed on the third job: {FL}, 1500mg magnesium bisglycinate stated as 300mg elemental at 80% NRV, two capsules with the evening meal, a mineral the smaller plate loses, with authorised claims for normal muscle function, normal energy-yielding metabolism, electrolyte balance and the reduction of tiredness and fatigue and no claim for weight loss, which this page does not make, batch tested for lead, mercury, arsenic and cadmium, UK made, 180 capsules for £19.99 at 22p a day, taken by a person whose deficit plate has lost the foods that carry it. The full label breakdown is here.

The verdict: when working out to lose weight, give supplements three jobs and never a fourth. Protect the muscle with protein at around 1.6g per kilogram and creatine held through the deficit. Protect the session with a caffeine tablet on the days it matters. Protect the plate with vitamin D through the winter, iron on a ferritin test and magnesium for a plate that has lost the foods that carry it. The deficit does the fat loss, a few hundred calories a day measured by the trend; the fat burners do grams for pounds; and the sleep a deficit worsens is protected before the shelf is read.

What to check on the label

Questions people also ask

What supplements help with weight loss when exercising?

None lose the weight, because the deficit does that, a few hundred calories a day below maintenance measured by the scale's trend; a supplement has three jobs in a deficit, protecting what the deficit puts at risk: the muscle, with protein at around 1.6g per kilogram and creatine at 3 to 5g a day holding the sessions productive; the session, with a caffeine tablet on the days it matters; and the plate, with vitamin D through the UK winter, iron on a ferritin test and magnesium if the smaller plate has lost the greens, nuts, seeds and wholegrains that carry it; the fourth job, burning fat, is sold and does not exist.

Should I take creatine while trying to lose weight?

Yes, for the first job: creatine at 3 to 5g a day with lifting has evidence for holding lean mass through a deficit by keeping the sessions productive at a time when energy is short, which matters because a body in a deficit takes some of its energy from muscle unless the muscle is used and fed; its first kilogram of intramuscular water goes the wrong way on the scale and is ignored in favour of the trend, and a person who stops it to see a lower number has traded a kilogram of water for a worse block.

Do fat burners work if you also exercise?

The trials, run in people already in a deficit and often exercising, show weight differences measured in grams over months, at a stimulant load that raises heart rate and blood pressure and a price in pounds a day; the one ingredient that does anything measurable is caffeine, a small rise in expenditure and a small fall in appetite, which a penny tablet delivers for the second job without the rest of the blend; a person who buys a fat burner has paid for the smallest term in the arithmetic and bought a stimulant load into a body a deficit has already left short of sleep.

How much protein should I eat to lose fat without losing muscle?

Around 1.6g per kilogram of body weight a day, spread across three or four meals, and toward the top of the range when the deficit is larger, because the research on fat loss with resistance training finds that intake holds lean mass through a deficit while most people cutting eat well below it; the protein comes from food first, since protein-rich food is the most filling thing on a deficit plate, and from a powder for the days the plate falls short, with the lifting kept heavy so that the muscle is used as well as fed.

Does magnesium help you lose weight?

No, and it makes no such claim; magnesium has authorised claims for normal muscle function, normal energy-yielding metabolism, electrolyte balance and the reduction of tiredness and fatigue, and its place in a deficit is the third job, protecting the plate, because the leafy greens, nuts, seeds, wholegrains and pulses that carry it are often the first foods a person cutting calories and carbohydrate removes; the worked example is 300mg elemental at 80% NRV in two capsules with the evening meal for 22p a day, batch tested for four metals and UK made, taken for the plate the deficit has shrunk.

Sources

1. The energy balance literature on fat loss: body fat falls when energy intake is below expenditure over a sustained period, the site of loss is set by genetics and sex and not by any food, timing or supplement, and resistance training with adequate protein preserves lean tissue during the deficit. PubMed record
2. The body recomposition literature: simultaneous muscle gain and fat loss is documented in resistance-trained and untrained people under high protein intakes of around 2.2 to 3g per kilogram with a modest energy deficit, most readily in beginners, those returning after a break and those with higher body fat, and is slower than pursuing either goal alone. PubMed record
3. The thermogenic supplement literature: caffeine and green tea catechin products increase daily energy expenditure by a few tens of kilocalories in trials, with meta-analyses finding weight effects of a few hundred grams or less over months, far below the effect of a modest energy deficit, and with no authorised UK weight-loss claim for any such ingredient. PubMed record
4. The UK National Diet and Nutrition Survey: a substantial minority of women of reproductive age have low iron stores and intakes below the reference, a large share of adults have low vitamin D status in winter, iodine intakes are low in young women, and magnesium intakes fall below the reference in many adults, with B12 deficiency concentrated in older adults, vegans and those on metformin or acid suppressants. https://www.gov.uk/government/collections/national-diet-and-nutrition-survey

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