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Creatine hair loss rests on one study
The hair loss claim
That study found creatine increased DHT, a hormone involved in follicle loss, but no change in any other sex hormone, which is odd if DHT really shifted. It has never been replicated to the best of anyone's knowledge, and it looked at a mechanism instead of an outcome.
Safety and testing
The kidney and liver concerns have been debunked, with no evidence that creatine harms healthy kidneys or liver. Creatine monohydrate is the most tested supplement in sport, with thousands of studies, and it has been shown to saturate muscle cells with phosphocreatine. Other forms, like creatine hydrochloride, rest on only a couple of studies and cost more.
Performance and body fat
Creatine improves exercise performance and recovery, raises strength, and increases lean mass, much of it by drawing water into muscle cells, which are mostly water anyway. Body fat percentage tends to fall, probably because lean mass rises. It is not a fat burner, but harder training and more lean tissue may affect fat mass. Some more recent work also shows cognitive benefits.
How does creatine help muscles work?
Muscle stores creatine as phosphocreatine, which hands a phosphate to ADP to rebuild ATP, the cell's immediate fuel. This reaction is very fast, so it powers short bursts of intense effort. Supplementation raises the amount of phosphocreatine stored in muscle. The phosphocreatine system is the main source of energy for roughly the first ten seconds of an all-out effort.
Why does creatine pull water into muscle?
Creatine is osmotically active, meaning it draws water toward wherever it concentrates. Muscle cells take it up through a sodium-dependent transporter, and water follows into the cell. Muscle tissue is already about three quarters water. The added cell volume is itself thought to act as a signal that favors building protein.
How did a single study start the hair-loss claim?
The 2009 study followed rugby players in South Africa and tracked hormone levels. It reported a rise in DHT, a hormone linked to follicle miniaturization in people prone to pattern baldness. Hair itself was never examined in the study. Because DHT is a step in the hair-loss pathway, the result spread as a hair-loss warning.
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