Creatine for muscle building: dosage, effects and safety according to science
Creatine is one of the most myth-laden topics in the fitness world. Water retention, kidney danger, mandatory loading phase... misconceptions die hard. Yet it is by far the most scientifically documented sports supplement, backed by hundreds of studies over several decades. We rely here on the official position of the International Society of Sports Nutrition to separate fact from fiction.
The most studied and effective supplement
The official ISSN position, published by Kreider and colleagues in 2017, is unequivocal: creatine monohydrate is the most studied and most effective form of creatine for increasing high-intensity exercise capacity and lean body mass. It is the most effective nutritional supplement currently available for athletes in terms of increasing high-intensity exercise capacity and muscle mass.
This is not a marketing claim — it is the summary of hundreds of studies evaluated by independent researchers. Creatine increases phosphocreatine stores in muscles, allowing more energy production during short, intense efforts (weight training sets, sprints). The result: more reps, heavier loads, and therefore more stimulus for muscle growth.
How much to take: 3 to 5 g per day
Two protocols exist. The first, with a loading phase: approximately 0.3 g per kg of body weight per day for 3 days (roughly 20 g/day for a 70 kg person), followed by 3 to 5 g per day for maintenance. This protocol rapidly saturates muscle creatine stores (in about 1 week).
The second, without loading: 3 to 5 g per day right from the start. Muscle stores fill up in 3 to 4 weeks instead of one. The end result is strictly identical — only the timeline differs. The loading phase is therefore NOT mandatory; it is simply faster.
Most practitioners prefer the no-loading method, which is simpler and avoids the digestive discomfort that the high dose can sometimes cause.
Is it dangerous? What science says
The ISSN is categorical: there is no scientific evidence of harmful effects from creatine monohydrate in the short or long term in healthy individuals at recommended doses. This conclusion is reinforced by the 2021 review (Antonio et al.) which addresses the most common questions and misconceptions.
The most widespread fears — kidney damage, hair loss, dehydration, cramps — are not supported by scientific data. Creatine may slightly increase blood creatinine (an indirect marker of kidney function), which can alarm an uninformed physician, but this does not reflect actual kidney damage.
How to take it properly
Monohydrate is the gold standard. Other forms (HCL, ethyl ester, buffered) have not demonstrated superiority and cost more. No need to overpay.
The timing of intake during the day matters little — morning, noon, evening, before or after training, the difference is negligible. What matters is consistency: taking your 3 to 5 g every day, without interruption. Taking it with carbohydrates or protein may slightly improve absorption, but it is not essential.
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Start nowScientific references
- Kreider RB, Kalman DS, Antonio J, et al. (2017). International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition. Lien
- Antonio J, Candow DG, Forbes SC, et al. (2021). Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show?. Journal of the International Society of Sports Nutrition. Lien
This article is for informational purposes only and does not replace professional medical advice. If you have kidney disease or any doubts, consult a physician before supplementing.