Best supplements for muscle growth, ranked by evidence

Only a handful of supplements reliably help you build muscle, and none of them matter as much as training, food and sleep. The short list: creatine monohydrate (best evidence for strength and muscle), protein powder (only if you can’t eat enough protein otherwise) and caffeine (better training sessions). A few others might help in specific cases; most of what fills supplement shelves doesn’t.

How we ranked them

The ranking follows the IOC consensus statement on supplements (Maughan et al., 2018), the ISSN position stands, and the meta-analyses behind them. A supplement gets “worth it” if repeated, well-controlled studies show a meaningful effect on strength, muscle or training quality in healthy people, and it’s safe. “Maybe” means real but small, conditional, or less consistent evidence. “Skip” means the evidence is weak, negative, or the product solves a problem you don’t have.

Worth it

Creatine monohydrate

The most researched supplement in sport. It raises phosphocreatine stores in muscle, letting you do a bit more work on hard sets, which adds up to more strength and lean mass over weeks and months. The ISSN position stand (Kreider et al., 2017) describes it as both effective and safe for healthy people at standard doses. Take 3–5 g daily, any time. Full details in our creatine guide.

Protein powder

Not magic, just convenient protein. A meta-analysis by Morton and colleagues (2018) showed that protein supplements improve muscle gains mainly by raising daily protein intake, with the benefit levelling off around 1.6 g per kg of bodyweight per day. If you already eat that much, a powder adds nothing. If you don’t, it’s often the cheapest and easiest fix. See our whey protein guide and how much protein to build muscle.

Caffeine

Coffee counts. The ISSN position stand on caffeine (Guest et al., 2021) supports 3–6 mg per kg about an hour before training for better strength, power and endurance. For a 75 kg person that’s roughly 225–450 mg, or two to four espressos depending on strength. The catch is sleep: caffeine late in the day can cost you more recovery than it gives. See does pre-workout work.

Maybe: helpful in specific situations

Beta-alanine

Raises carnosine levels in muscle, which buffers acid during intense efforts. A meta-analysis by Saunders and colleagues (2017) found a small benefit for exercise lasting roughly 0.5 to 10 minutes. For typical sets of 5–12 reps (under a minute), the benefit is limited. It’s more useful for high-rep work, circuits and combat or team sports. Side effect: a harmless tingling sensation (paraesthesia); smaller split doses reduce it.

Vitamin D

If you’re deficient, which is common in northern countries during winter and in people who rarely go outside, correcting it matters for health and possibly muscle function. If you’re not deficient, extra vitamin D won’t build muscle. A blood test settles it.

Omega-3

Good for heart health if you rarely eat oily fish. Effects on muscle growth in young lifters are small or unclear. Eating fish twice a week covers the same ground.

Citrulline malate

Some studies show slightly more reps in high-rep sets and less soreness; others show nothing. If you want a pre-workout ingredient that isn’t caffeine, it’s the most plausible option, but expect modest effects.

Skip: save your money

BCAAs

Leucine, isoleucine and valine are essential for muscle building, but they’re already in every protein food. As Wolfe (2017) explained in a review, BCAAs alone can’t sustain muscle protein synthesis because the body still needs the other essential amino acids. If you eat enough protein, BCAAs are redundant.

Testosterone boosters

Tribulus, fenugreek, D-aspartic acid, ashwagandha blends and similar products don’t produce meaningful increases in testosterone or muscle in healthy men. Some have been found to contain undeclared prescription drugs.

Fat burners

Mostly caffeine with expensive extras. Some contain stimulants that are risky for your heart. Fat loss comes from a calorie deficit.

Glutamine, HMB, “mass builders”

Glutamine doesn’t build muscle in healthy people. HMB may help untrained or older people slightly but shows little benefit in trained lifters. “Mass gainers” are protein plus cheap carbs; you can make your own with milk, oats and peanut butter.

What actually builds muscle

Supplements sit on top of a pyramid. From the bottom:

1. Consistent, progressive training with enough hard sets per muscle.
2. Enough calories and protein.
3. Sleep (7–9 hours; see sleep and muscle growth).
4. Time and consistency.
5. Supplements.

If a supplement could replace any of the first four, it would be a drug. The basics are covered in our pillar guide on how to build muscle.

The cheapest performance enhancer is knowing exactly what you did last session, so you can beat it. Brick shows your last weights and reps on every set, flags PRs automatically and charts your estimated strength over time. If you start creatine or change anything else, the trend line tells you whether it moved the needle.

A sensible supplement stack

• Beginner: nothing, or creatine.
• Intermediate lifter, busy schedule: creatine + protein powder + coffee before training.
• Vegetarian/vegan: creatine (you’ll likely respond more), plant protein powder if needed, and check vitamin B12 and D with your doctor.
• Older lifter: creatine, adequate protein (powder helps), vitamin D if low.

Total cost: a few euros a week. Anything far beyond that is usually paying for marketing.