Creatine Monohydrate

Creatine is the most researched supplement in sports nutrition and one of the few with an evidence base substantial enough to say with confidence that it works. It’s been studied for decades across hundreds of trials, the mechanism is well understood, and the results are consistent — creatine supplementation improves performance in short-duration, high-intensity efforts and supports muscle growth over time when combined with resistance training. For anyone training with weights, creatine is the supplement most likely to produce a noticeable difference.

The mechanism is straightforward. The body uses a compound called phosphocreatine to rapidly regenerate ATP — the molecule that powers muscular effort — during intense activity. Phosphocreatine stores are limited and deplete quickly during high-intensity work, which is why maximum effort can only be sustained for seconds before performance drops. Supplementing with creatine increases phosphocreatine stores in muscle, which means more fuel available for those high-intensity efforts, slightly more reps completed before fatigue, slightly more weight moved over time. That marginal improvement compounds across weeks and months of training into meaningfully greater strength and muscle gains than training without it.

Creatine also draws water into muscle cells, which produces a modest but noticeable increase in body weight — typically one to three kilograms — when beginning supplementation. This is water, not fat, and it’s part of why muscles look and feel fuller on creatine. It’s worth knowing about so the scale change doesn’t prompt unnecessary concern.

The safety profile of creatine monohydrate is about as clean as a supplement can be. Decades of research in healthy adults have not identified meaningful adverse effects at standard doses. The kidney concerns that circulated in popular culture were not supported by the evidence and have largely been retired by the research community. It’s safe for healthy people at recommended doses.

Creatine monohydrate is the form to use. It’s the most researched, the most affordable, and performs as well as or better than every more expensive form — creatine HCl, buffered creatine, creatine ethyl ester — that has been marketed as superior. The marketing around alternative forms consistently outpaces the evidence for them.

Reference Card

Category: Supplement Pillar: Nourish — peak of the pyramid

What it does

Increases phosphocreatine stores in muscle — more fuel available for short-duration, high-intensity effort
Supports strength gains and muscle growth when combined with resistance training
Draws water into muscle cells — modest increase in body weight and muscle fullness

Who it’s most relevant for

Anyone training with resistance exercise who wants to maximize strength and muscle gains
Athletes in sports requiring repeated high-intensity efforts
Older adults — emerging evidence supports creatine for muscle preservation and potentially cognitive function with age

How to use it

Standard dose — 3 to 5 grams per day
Loading phase — 20 grams per day split across four doses for five to seven days, followed by 3 to 5 grams maintenance; saturates muscle stores faster but produces the same end result as a standard dose over three to four weeks
Timing — not meaningfully important; taking it consistently matters more than when
Form — creatine monohydrate only; no evidence supports paying more for alternative forms

Considerations

Expect one to three kilograms of water weight gain when starting — this is normal and expected
Works best with consistent daily use — creatine stores accumulate over time rather than producing acute effects
Non-responders exist — a small percentage of people have naturally high muscle creatine saturation and notice less benefit
Micronized creatine monohydrate dissolves more easily in water — worth choosing if mixing is a concern

Common myths

Creatine causes kidney damage — the evidence in healthy adults does not support this; people with pre-existing kidney conditions should consult a doctor, but healthy kidneys handle creatine well
You need to cycle creatine on and off — there is no evidence that cycling is necessary or beneficial; consistent daily use is appropriate
Creatine HCl or other forms are superior to monohydrate — the evidence does not support paying more for alternative forms; monohydrate is the gold standard