Best Supplements for Muscle Growth

Creatine is stored in muscle as phosphocreatine and used to regenerate ATP during short, hard efforts. More stored creatine means slightly more work completed before fatigue, which over months of training accumulates into more total training volume and more muscle.

It is one of a very short list of supplements the IOC consensus statement identified as having enough evidence behind them to expect a real performance effect, alongside caffeine, nitrate and sodium bicarbonate. Beta-alanine is on that list too, with weaker support.

Dose: 3 to 5g a day of creatine monohydrate, taken at any time of day, indefinitely. A loading phase of about 20g a day for five days fills the muscle faster and is optional; the same saturation is reached in three to four weeks at 3 to 5g.

Form: monohydrate. The more expensive forms, including hydrochloride, ethyl ester and buffered versions, have not been shown to outperform it.

Expected effect: a few percent more work in the gym, and a small initial gain in body weight from water drawn into muscle cells. Roughly a fifth to a third of people are non-responders, usually those whose diets are already high in red meat and fish and whose muscle stores are close to full.

Protein supplementation increases muscle mass and strength gains from resistance training, and the effect is entirely dose-dependent. The 2018 BJSM meta-analysis of 49 trials found gains stopped once total intake reached about 1.62g per kilogram of body weight per day.

The practical consequence is that a powder helps someone eating 1.0g per kilogram and does nothing at all for someone already eating 1.8g. Work out where you currently sit before buying anything. Our guide to how much protein you need covers the arithmetic, and the whey against plant protein comparison covers which powder to pick if you do have a gap.

Vitamin D is on this list for a British reason. Between October and early March the sunlight in the UK is too weak for the skin to make any, so intake has to come from food or a supplement. The NHS recommends that everyone consider a daily 10 microgram supplement through the autumn and winter, and that people with little sun exposure or darker skin take one year round.

Correcting a deficiency restores muscle function that the deficiency was impairing, and in older adults it contributes to bone health and falls risk. Taking more than the recommended amount when levels are already normal has not been shown to build muscle, and very high doses carry their own risks.

Treat it as filling a gap that the UK climate creates rather than as a performance supplement.

Beta-alanine. Buffers acidity in muscle and reliably improves performance in efforts lasting roughly one to ten minutes. That is an endurance and high-intensity effect rather than a muscle-growth one. Causes harmless tingling in the skin at higher single doses.

HMB. A leucine metabolite marketed for muscle gain. Trials in trained people have been largely disappointing, and the more promising results come from untrained participants and from settings where muscle is being lost rather than built, such as bed rest and illness. That second use is the more interesting one, and it is not what it is sold for.

Branched-chain amino acids. Three of the nine essential amino acids, sold as though they were the important ones. Muscle protein synthesis needs all nine, so BCAAs on their own produce a weaker response than whole protein. Anyone eating adequate protein is already getting more BCAAs than the supplement contains.

Collagen. Evidence for tendon and connective tissue is developing and is more interesting than the muscle claims, which do not stand up. Collagen is a poor-quality protein for muscle building, low in the essential amino acids that matter for it.

Testosterone boosters, growth hormone releasers and nitric oxide products. No credible evidence of meaningful effect on muscle mass in healthy people. This category is also where contaminated and adulterated products are most often found.

Food supplements are regulated as food rather than as medicine, which means no one verifies before sale that the contents match the label. Analytical surveys have repeatedly found sports supplements containing anabolic agents and stimulants that were not declared, most often in the muscle-building and fat-loss categories.

For anyone in tested sport this is a career risk, since anti-doping rules hold the athlete responsible for whatever is in their body. For everyone else it is a health risk, and an undeclared stimulant is a genuine problem for someone with a heart condition or high blood pressure.

The practical protection is to buy products carrying a third-party batch-testing certification such as Informed Sport, to be sceptical of proprietary blends that hide individual doses, and to avoid products promising results that only a drug could deliver.

Anyone taking prescribed medication, pregnant, breastfeeding, or living with kidney or liver disease should check with a pharmacist or GP before starting a supplement.

What has changed over the past couple of years is the order in which the questions arrive. People used to ask about supplements after their training had plateaued. Now the stack is often already in place when they walk in, assembled from short videos, and the first appointment includes a photograph of five tubs.

The clinically useful observation is what the stack tends to be compensating for. Someone training four times a week on six hours of sleep, with an old ankle sprain that quietly stopped them loading one leg properly, has a ceiling that no supplement touches. The gains sitting unclaimed in that picture are far larger than the few percent creatine offers, and they are free. Sleep, total food intake and a leg that can take load are the three things worth fixing before anything is bought, and the third is the one people cannot assess for themselves, because it shows up as an asymmetry rather than as pain.

If your training has stalled around an old injury, our sports injury and performance assessment is built to find what is limiting the load.

What is the best supplement for building muscle?
Creatine monohydrate, at 3 to 5g a day. It has more supporting evidence than any other ergogenic supplement and costs very little.

Do I need protein powder to build muscle?
Only if your daily protein intake falls short of about 1.6g per kilogram of body weight. Above that, extra protein adds nothing to the result.

Are BCAAs worth taking?
Not if you eat enough protein. Muscle protein synthesis requires all nine essential amino acids, and whole protein sources supply them along with more BCAAs than the supplement does.

Does HMB build muscle?
The evidence in trained people is weak. The more promising research is in preserving muscle during illness or immobility, which is a different use from the one it is marketed for.

Are supplements safe?
They are regulated as food rather than as medicine, and surveys have repeatedly found undeclared substances in sports supplements. Batch-tested products carrying a certification such as Informed Sport are the safer choice.