Creatine: the boring supplement that actually works

01Does creatine actually work?

Your muscles already run on creatine — a normal diet supplies 1–2 g a day and keeps stores roughly 60–80% full [1]. Supplementing tops off the tank: muscle creatine and phosphocreatine rise another 20–40%, the mechanism the ISSN credits for the performance effects [1].

The depth of the file is the story. The ISSN position stand calls creatine monohydrate the most effective ergogenic supplement available to athletes for increasing high-intensity exercise capacity and lean mass during training [1]. Pooled across 53 randomized trials, it beat placebo on upper-limb strength independent of population, training protocol, dose, or duration [3]. The edge is modest — and it keeps replicating. Boring is the compliment.

02How much creatine per day?

3–5 g of creatine monohydrate, daily, is the entire protocol. Taken at that dose, muscle stores fill over 3–4 weeks and stay full for as long as you keep taking it [1].

Loading — 5 g four times a day for 5–7 days — is the express lane, saturating stores in about a week instead of a month [1]. It isn't required: smaller daily doses are effective, which is exactly why the 2021 expert review calls the loading phase optional [2]. One honest caveat — most of the early performance data comes from loading studies, so the slow route's first weeks are less documented [1]. The destination is identical.

03Is the water weight real?

Partly — and it's the least dramatic side effect in sports nutrition. Over 1,000 studies in, the only consistently reported side effect of creatine supplementation is weight gain [1]. During a loading week, early studies measured about 0.5–1.0 L of short-term fluid retention, roughly proportional to the weight gained [1] — creatine is osmotically active, and some water follows it into the muscle [2].

Then it settles. Multi-week training studies show no increase in total body water, and the expert review's conclusions read flatly: creatine does not always lead to water retention — and it does not increase fat mass [2]. A small early step-up on the scale is stored fuel and water, not fat. Expected, bounded, fine.

04Is creatine bad for your kidneys?

For healthy adults, the record is long and dull — the good kind of dull. The 2021 evidence review states it plainly: at recommended dosages, creatine does not result in kidney damage or renal dysfunction in healthy individuals [2]. In athletes who had supplemented anywhere from 10 months to 5 years, creatinine, urea, and albumin handling matched non-users — glomerular filtration normal in both groups [4].

The boundary is the word healthy. Every finding above was built in people with normal kidney function. If your kidneys come with a diagnosis, this isn't your breakdown — it's a conversation with your clinician.

05Which creatine should you buy?

Plain creatine monohydrate powder — the cheap tub with one ingredient on the label. Claims that other forms degrade less in the body or reach muscle better are, in the position stand's words, currently unfounded [1]. The 2021 review goes further: evidence-based research clearly shows creatine monohydrate to be the optimal choice [2]. Monohydrate is also the form behind nearly all of the research — the safety record belongs to it.

Skip the pre-mixed liquids while you're at it. Creatine isn't stable in solution, and efforts to build a stable ready-to-drink at effective doses have been unsuccessful [2]. Powder in water, same day, done.

And the incentive check, because this is a supplement article: we sell nothing. No powder, no discount code, no affiliate anything. Pair this with the protein math breakdown and the supplement-aisle conversation is, for most people who train, over.