Creatine: the one supplement that earns its shelf space

If you’re going to take exactly one supplement, this is the strongest candidate — not because it’s dramatic, but because the evidence is deep and the downside is close to nil. The International Society of Sports Nutrition, reviewing hundreds of studies, calls creatine monohydrate the most effective ergogenic nutritional supplement available for increasing high-intensity capacity and lean mass.

Two things keep it honest. First, the effect is modest and only shows up alongside training — creatine amplifies the work you do; it doesn’t replace it. Second, it belongs in the supplement tier precisely because it can’t outrank the foundation it supports. A great creatine habit on top of no training is just expensive urine.

How to actually take it

Three to five grams a day of plain monohydrate, at any time, indefinitely. The old “loading phase” is optional — it just fills your stores faster. You don’t need the pricey branded esters and buffered forms; monohydrate is the version with the research and the one that costs almost nothing. Some people gain a pound or two of water early on, which is intramuscular, not fat.

The safety record is reassuring: no evidence of harm in healthy people even at high doses over years. If you have kidney disease, clear it with a clinician first — sensible caution, not a red flag for everyone else.