At a glance:
- Creatine monohydrate has the strongest evidence of any supplement for increasing muscle mass and strength.
- A protein supplement helps if your protein intake from food falls below 1.6 g per kilogram of body weight.
- Most expensive sports supplements offer no significant additional benefit alongside creatine or whey protein.
- Supplements only work alongside consistent strength training, adequate sleep and a balanced diet.
Supplements for muscle growth are one of the most searched-for topics in sports nutrition — the promises are big, but the scientific evidence is much more limited. In this overview, we look at which supplements are supported by science, which rely on marketing hype and what every athlete should know before buying.
Which supplements for muscle growth are scientifically proven?
Creatine monohydrate is a rare exception in the supplement world: it has been the subject of over 500 controlled studies, and the International Society of Sports Nutrition (ISSN) places it in its highest evidence category (Kreider et al., 2017). Creatine increases phosphocreatine stores in your muscles, speeds up ATP regeneration during intense training and helps you perform more repetitions — which means more muscle mass over time.
Protein supplements — particularly whey protein — also have strong supporting evidence. A meta-analysis by Morton et al. (2018), which included data from over 1800 study participants, found that protein supplementation alongside resistance exercise increased muscle mass by an average of 0.3 kg more than a placebo. However, this effect only occurs when total daily protein intake is sufficient.
For more context, read this broader overview: 💊 Are supplements necessary? When to actually use them.
How much protein do you need each day for muscle building?
The scientific consensus recommends 1.6–2.2 g of protein per kilogram of body weight per day for muscle building (Morton et al., 2018). If you weigh 80 kg, you therefore need 128–176 g of protein a day. Many people can get this through food — eggs, meat, fish, dairy products and legumes often cover their needs.
A protein supplement makes sense when you cannot get enough protein from food: this may apply if you lead an active lifestyle, are vegetarian or are an athlete with a higher body weight. Supplements for athletes explains when supplements are a worthwhile choice.
The NIH Office of Dietary Supplements emphasizes that protein supplements are not essential for most healthy adults if their diet is balanced and they eat enough.
Does creatine really work for muscle building?
Yes. EFSA (the European Food Safety Authority) has officially approved the health claim that creatine improves strength during repeated short bouts of intense training (EFSA, 2011). This means you can perform more repetitions before fatigue sets in — and a higher training volume leads to greater muscle growth over time.
The recommended dose is 3–5 g of creatine monohydrate per day. A loading phase (around 20 g per day for 5–7 days) speeds up muscle saturation but is not essential — a lower dose achieves the same result within a few weeks. You can find a detailed overview of how creatine works here: What is creatine and how does it work, and a further explanation here: What is creatine and how does it work.
Which supplements offer less evidence-based benefit for muscle building?
Beta-alanine is an amino acid that buffers acids produced in your muscles during intense training. A meta-analysis by Hobson et al. (2012) found improved performance during high-intensity efforts lasting 1–4 minutes. It may indirectly support more intense training, but its direct effect on muscle mass is more modest than creatine’s.
BCAA (branched-chain amino acids) — if your daily protein intake is already sufficient, a separate BCAA supplement offers no significant additional benefit. Whey protein and eggs already contain all the amino acids you need in optimal proportions.
Mass gainers often contain large amounts of simple carbohydrates and sugar. They provide calories, but muscle growth depends primarily on a training stimulus and sufficient protein — not just calories.
Practical advice: start with creatine monohydrate (3–5 g/day) and make sure your daily protein intake is at least 1.6 g/kg of body weight. These two steps provide the best evidence-based foundation. Choose certified products (e.g. Informed Sport, NSF Certified for Sport), which guarantee the absence of banned substances.
References
- Kreider RB et al. (2017). International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. PMID: 28615996
- Morton RW et al. (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. Br J Sports Med. PMID: 28698222
- Hobson RM et al. (2012). Effects of β-alanine supplementation on exercise performance: a meta-analysis. Amino Acids. PMID: 22270875
- EFSA Panel on Dietetic Products, Nutrition and Allergies (2011). Scientific Opinion on the substantiation of health claims related to creatine. EFSA Journal. DOI: 10.2903/j.efsa.2011.2303
- NIH Office of Dietary Supplements (2023). Dietary Supplements for Exercise and Athletic Performance. Available at: https://ods.od.nih.gov/factsheets/ExerciseAndAthleticPerformance-HealthProfessional/
Frequently asked questions
Is creatine safe for long-term use?
Yes — studies lasting up to 5 years have found no adverse health effects in healthy adults taking the recommended doses (3–5 g/day) (Kreider et al., 2017). People with kidney problems should consult a doctor first.
When is the best time to take creatine?
Studies show no significant advantage to taking creatine after a workout rather than before — consistent daily use matters more. Many athletes take creatine after a workout alongside a protein supplement.
Can a protein supplement replace protein from food?
No — protein from food is always preferable because it comes with other essential nutrients. Protein powder is a convenient addition when you cannot meet your daily protein needs through food.
Do beginners need supplements for muscle building?
No. As a beginner, you can build muscle mass effectively without supplements if your training, sleep and nutrition are in order. Creatine and protein supplements become more useful when progress starts to slow as you gain training experience.
What is the difference between whey protein and plant-based protein powder?
Whey protein is absorbed quickly and contains all the essential amino acids in optimal proportions. Plant-based protein powders (pea protein, rice protein and others) are a good alternative, but combining different sources helps provide a complete amino acid profile.
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