The Truth About Creatine: Hair Loss, Kidney Health, and Other Myths

Creatine is one of the few supplements I recommend without much hesitation. It also attracts more myths than almost anything else on the shelf.

You have probably heard that it makes you bald. That it wrecks your kidneys. That it is “basically a mild steroid.” None of these creatine myths hold up, and in this guide we will go through why, one at a time, with the actual studies linked so you can read them yourself. (For how creatine compares with protein powder, pre-workouts and caffeine, see our complete guide to creatine, protein powders and caffeine.)

Quick version first, then the science.

What creatine actually is

Creatine is a compound your body already makes from three amino acids (arginine, glycine and methionine), mainly in the liver, kidneys and pancreas. According to Mayo Clinic, a typical diet gives you about 1-2 grams a day from foods like fish and red meat, and your body replaces about 1-3 grams a day to keep its stores topped up.

Almost all of it sits in your muscles as phosphocreatine, a small, fast energy reserve.

Here is the mechanism in plain terms. Your muscles run on ATP. During a hard set, ATP gets used up within seconds and turns into ADP, which cannot power a contraction on its own. Phosphocreatine hands a phosphate back to ADP and rebuilds ATP almost instantly. More stored creatine → faster ATP recycling → one or two extra good reps before you hit the wall.

That is it. No hormones involved.

Why those extra reps matter

One or two extra reps per set sounds trivial. Over months it is not. More quality reps means more total training volume at a decent load, and that is one of the main things driving strength and muscle growth.

The research backs this up. A 2022 meta-analysis of randomized trials found creatine increased lean body mass by about 0.68 kg overall, and by about 1.10 kg when it was combined with resistance training, regardless of age (Delpino et al., 2022). Without training, the effect was not significant. Creatine helps you train harder; it does not build muscle on the sofa.

The International Society of Sports Nutrition calls creatine monohydrate the most effective nutritional supplement currently available for increasing high-intensity exercise capacity and lean mass during training (Kreider et al., 2017).

Myth 1: “Creatine makes you lose your hair”

This is the one that stops most guys from trying it, so let’s be precise about where it came from.

In 2009, researchers gave creatine to 20 college rugby players and measured their hormones. After a week of loading, DHT (the androgen linked to male pattern baldness) was 56% higher, and it stayed about 40% above baseline after two more weeks of maintenance dosing (van der Merwe et al., 2009).

Notice what was never measured: hair. Not one hair was counted. And in the 15-plus years since, nobody replicated the DHT finding.

Then in 2025 someone finally ran the obvious experiment. A 12-week randomized, placebo-controlled trial gave men 5 g of creatine a day and directly measured DHT, the DHT-to-testosterone ratio, hair density, hair thickness and follicle health. Result: no differences between creatine and placebo on any hormone or hair outcome (Lak et al., 2025). The authors describe it as the first study to directly assess hair follicle health after creatine, and as strong evidence against the hair loss claim.

Myth 2: “Creatine damages your kidneys”

This myth has a real-looking origin: blood tests.

Doctors estimate kidney function partly from creatinine levels in your blood. Creatine breaks down into creatinine. So when you take creatine, your blood creatinine goes up a little, and an automated lab report may flag it. The kidneys did not get worse. You simply have more creatine turning over.

A 2025 meta-analysis of 21 studies looked at exactly this (Naeini et al., 2025). Creatine produced a small, statistically significant rise in serum creatinine, but no significant change in glomerular filtration rate (GFR), the measure that actually tells you how well your kidneys filter. The authors attribute the creatinine change to metabolic turnover rather than kidney damage.

Mayo Clinic’s summary lines up: studies in healthy people taking creatine have not found that it harms kidney function at recommended doses, and creatine is likely safe for many people for up to five years (Mayo Clinic). Long-term data in athletes followed for up to 21 months also showed no meaningful changes in clinical health markers (Kreider et al., 2003).

Myth 3: “Creatine is basically a steroid”

No. Anabolic steroids are synthetic hormones built on testosterone’s ring structure, and they act directly on androgen receptors. Creatine is a small nitrogen-containing molecule your own body makes every day. It is sold legally as a food supplement and is permitted by sports anti-doping bodies.

The confusion comes from the results: people gain strength and look fuller. That is ATP recycling plus water stored in the muscle, not hormones.

Myth 4: “Creatine causes bloating, cramps and dehydration”

Two different things get lumped together here.

Water weight is real. Creatine draws water into muscle cells. Most people put on roughly 1-2 kg in the first few weeks, faster with a loading phase. This water sits inside the muscle, not under the skin, so it does not create the puffy “bloated” look people worry about. It is also part of how creatine works. We unpack the difference in creatine water weight vs bloating.

Cramps and dehydration are not. A 2008 review in the British Journal of Sports Medicine went through the evidence and found nothing to support creatine causing muscle cramps or dehydration (Dalbo et al., 2008).

Stomach discomfort is the one side effect that does show up, mostly when people take 10-20 g in one go. Splitting the dose fixes it.

Myth 5: “You need to load, cycle and time it perfectly”

None of these are required.

Loading is optional. We compare both approaches in detail in creatine loading vs daily maintenance, but the short version: taking about 20 g a day (split into four doses) for 5-7 days saturates your muscles in roughly a week. Taking 3-5 g a day from the start gets you to the same place in about three to four weeks (Hultman et al., 1996).

Cycling is unnecessary. There is no good evidence that healthy people need to come off creatine, and both the ISSN and Mayo Clinic support continuous use at recommended doses.

Timing barely matters. Creatine works by filling a store over weeks, so the daily habit matters far more than whether you take it before or after training. Take it with whichever meal you never skip. The research on this is covered in creatine timing: pre vs post-workout.

How to take creatine: the simple protocol

• What: plain creatine monohydrate. It is the form used in almost all the research, and the cheapest. Fancier forms have not beaten it (see creatine forms compared). Pick a product with third-party testing.
• How much: 3-5 g a day. Bigger lifters can sit at the top of that range. Get a number for your body weight with our creatine dosage calculator.
• When: any time, every day, including rest days.
• With what: water, milk, a protein shake or mixed into curd. Whatever you will actually do.
• How long: indefinitely, if you tolerate it well.

That is the whole protocol. Everything else on the supplement shelf is optional by comparison.

Who should be careful

Creatine is well studied in healthy adults. Check with a doctor first if you:

• have kidney disease or reduced kidney function, or diabetes that affects your kidneys
• are pregnant or breastfeeding
• take medication that affects your kidneys (some painkillers, diuretics, certain blood pressure drugs)
• are under 18 and not training under supervision

The bottom line

Creatine is the most researched sports supplement there is. The hair loss scare came from one small study that never measured hair, and the first trial that did measure it found nothing. The kidney scare comes from misreading a blood marker. In healthy people, 3-5 g a day of creatine monohydrate is safe, cheap and reliably helps you train a little harder.

It is not magic, though. Creatine adds roughly a kilo of lean mass on top of good training. The training, the protein and the sleep still do the heavy lifting. If you want a program that gets those right, start with our free push pull legs plan and work out your daily protein with the protein calculator.