🧪 Supplement
creatine
The most-studied sports supplement — and one of the most-hyped. The evidence is rock-solid for muscle, strength, safety and dosing (no loading needed, monohydrate is best, it doesn't wreck your kidneys or your hairline). The viral 'fat-loss secret / fixes insulin / anti-cancer' claims are where it outruns the science. Brain and bone benefits are real but conditional — a stressed or aging brain, and training-supported bone.
10 well-supported · 1 disputed. This shows how settled each sub-question is, not whether creatine is "good." Direction lives in each claim below.
The 15 claims about creatine
Each keeps its own verdict — we never average them away.
Does creatine cause cramps or dehydration?
Strong support No — that's a gym myth. Controlled studies, including in dehydrated athletes exercising in the heat, find creatine doesn't harm hydration or cause cramping. If anything, the extra water it pulls into muscle may be protective.
Does creatine damage your kidneys?
Strong support No — not in healthy people at normal doses. Creatine nudges up a blood marker (creatinine) that can look like kidney trouble on a test, but meta-analyses and even genetic studies find no actual harm. Existing kidney disease is a separate conversation with your doctor.
Does creatine actually make you stronger and more powerful?
Strong support Yes — this is one of the best-established supplement effects there is. Paired with resistance training, creatine reliably adds strength and power across ages and both upper and lower body. The boost is modest but real and well-replicated.
Is creatine safe to take long-term?
Strong support Yes — it has one of the strongest safety records of any supplement, with no harm to kidney, liver, or heart markers in healthy adults across trials lasting years. Claims that literally everyone should take it, including pregnant or clinical populations, go further than the evidence.
Does creatine monohydrate help build muscle?
Strong support Yes — creatine plus resistance training reliably adds strength and roughly a kilo of lean mass across many trials; the effect is real though modest and depends on actually training.
Can creatine help with depression?
Insufficient Maybe, as an add-on to antidepressants — one promising trial found it boosted recovery in women taking an SSRI. But that trial and its main support come from a single research group, so it isn't confirmed yet. Interesting, not established.
Is plain creatine monohydrate as good as the fancier, pricier forms?
Strong support Yes — monohydrate is the most-studied, nearly fully absorbed, and cheapest form. Head-to-head trials show newer forms like HCl or ethyl ester are no better, and none is proven safer. Save your money.
Will creatine make your hair fall out?
Leans support Probably not. The fear comes from a single small study that saw a rise in a hair-related hormone but never actually checked hair. A 2025 trial that did measure hair found no effect — reassuring, though the direct evidence is still thin.
Does creatine help people with Alzheimer's?
Insufficient Too early to say. Just one small pilot — with no placebo group — has tested it in Alzheimer's patients. It raised brain creatine and hinted at benefit, but you can't draw conclusions from an uncontrolled study. Worth a real trial, not a recommendation.
Can creatine help older adults stay strong and mobile?
Leans support Probably, when combined with resistance training — it builds the strength and muscle that everyday tasks depend on. But trials measuring real-world function directly are mixed, so it's a lean yes, not a sure thing.
Can creatine protect your bones?
Leans support Possibly, for postmenopausal women who also strength-train — a year-long trial slowed hip bone loss. But another review found no boost to bone density, and nearly all the evidence comes from one research group. A cautious maybe.
Does creatine 'fix' your blood sugar or insulin?
Insufficient Not for most people. One trial in type-2 diabetics improved blood sugar — but only alongside exercise, the evidence is inconsistent, and the positive results come mainly from one lab. Not the insulin fix the headlines suggest.
Does creatine supplementation improve cognition?
Leans support Partly — creatine helps cognition mainly in specific situations (older adults, vegetarians, sleep deprivation); the largest trial in healthy young adults found no reliable benefit, so 'awesome cognitive benefits' overstates it for most people.
Is creatine a secret fat-loss trick?
Contested No — despite the headlines, independent studies find creatine doesn't actually reduce fat mass. It adds muscle, which can shift your body-fat percentage a little, plus a small effect in older adults who train. It's a muscle supplement, not a fat burner.
Does creatine fight cancer?
Leans against The evidence leans the other way. In animal studies creatine has actually promoted cancer spread, and blocking it slowed colon cancer — the opposite of 'anti-cancer.' Its role is complex and unproven in humans, and there's no basis to take it to prevent cancer.
Educational only, not medical advice. Hub descriptions are curated for honesty; see the methodology.