Creatine Side Effects: Hair Loss, Bloating and Kidney Myths

Creatine is one of the most researched sports supplements in the world, yet it still attracts more rumours than almost anything else on the shelf. Will it make your hair fall out? Is the weight you gain just "water"? Is it hard on your kidneys? If you have been put off by something you read in a forum or heard in the changing room, this guide walks through the most common concerns one by one and explains what the research actually shows.

First, what creatine is (and isn't)

Creatine is a compound your body makes from amino acids and stores mainly in skeletal muscle, where it helps regenerate ATP, the molecule that powers short, intense efforts such as a heavy set or a sprint. You also get some from food, chiefly meat and fish. A supplement simply tops up those muscle stores.

Creatine monohydrate is by far the most studied form. It is not a steroid, not a hormone and not a stimulant. In the UK, one health claim is authorised for it: creatine increases physical performance in successive bursts of short-term, high intensity exercise, with the beneficial effect obtained from a daily intake of 3 g. That is the context for everything below: a well-understood nutrient used at a modest daily dose.

If you train with weights, do interval sessions or play stop-start sports, a simple micronised monohydrate is all you need. Our own Creastrong® is exactly that: plain creatine monohydrate, milled to a fine powder so it mixes easily in water.

Myth 1: "Creatine causes hair loss"

This is the concern we hear most, and it traces back to a single study. In 2009, researchers gave creatine to 20 college-age rugby players for three weeks and measured their hormones. Levels of dihydrotestosterone (DHT), a hormone linked to male-pattern hair loss in genetically predisposed men, rose compared with baseline, although they stayed within the normal range. Hair itself was never measured.

That result has not been replicated. A 2021 review in the Journal of the International Society of Sports Nutrition looked at the studies measuring testosterone after creatine use: most found no change, and none documented hair loss. More recently, a 12-week randomised, placebo-controlled trial in resistance-trained men measured DHT and assessed hair count and density directly, and found no meaningful difference between the creatine and placebo groups.

The fair summary: there is no good evidence that creatine causes hair loss. If male-pattern thinning runs in your family, it is likely to happen with or without creatine, and a GP or dermatologist is the right person to talk to about it.

Myth 2: "It just makes you hold water"

Partly true, but not in the way people mean. When creatine stores in muscle rise, the muscle cells draw in some extra water. This is water inside the muscle, not the puffy, under-the-skin retention people worry about. Many people see the scales go up by a kilo or so in the first weeks, especially if they use a loading phase of around 20 g a day.

How to minimise the initial jump

• Skip the loading phase and take a steady 3–5 g a day. Muscle stores will still fill up, just over three to four weeks instead of one.
• Keep an eye on salt and alcohol, which have far more to do with feeling "bloated" than creatine does.
• Judge progress by how your training and clothes feel, not by a single weigh-in.

If you are unsure how much to take, our simple creatine dosing guide covers loading versus steady intake in more detail.

Myth 3: "Creatine damages your kidneys"

This myth usually comes from a misunderstanding of blood tests. Creatinine, a normal breakdown product of creatine, is one of the markers doctors use to estimate kidney function. Taking creatine can nudge creatinine up slightly, which can look like a red flag on paper even when the kidneys are working normally.

Long-term studies in healthy adults taking recommended doses have not shown harm to kidney function, and the International Society of Sports Nutrition's position stand describes creatine monohydrate as safe for healthy people at recommended intakes. Two sensible caveats:

• If you have, or have had, a kidney condition, or you take medication that affects the kidneys, speak to your GP before using creatine.
• If you are having a routine blood test, tell the clinician you take creatine so they can interpret your creatinine result correctly.

Myth 4: "It upsets your stomach"

Some people do get mild stomach discomfort, but it is almost always linked to large single doses. Research has found that taking 10 g in one go is more likely to cause loose stools than splitting the same amount into smaller servings. At 3–5 g a day, most people notice nothing at all.

Tips if your stomach is sensitive:

• Take it with a meal rather than on an empty stomach.
• Mix the powder into plenty of liquid (at least 250 ml).
• If you dislike powders, tablets are an easy alternative. Three Creastrong® Tablets provide 3 g of creatine.

Myth 5: "You need to cycle it"

There is no physiological reason to cycle creatine on and off. Your body does not "switch off" its own production permanently, and studies running for months to years have used continuous daily intake. Consistency is what keeps muscle stores topped up, so the most effective routine is the simplest one: the same dose, every day, including rest days.

Myth 6: "Creatine is only for young men bodybuilding"

Creatine is useful for anyone doing repeated short, high-intensity efforts, regardless of sex or age. Interest among women has grown hugely, and there is a specific authorised claim for older adults: daily creatine consumption can enhance the effect of resistance training on muscle strength in adults over the age of 55 (with 3 g a day alongside resistance training). We cover these groups in our guides to creatine for women and creatine over 55.

Who should be cautious

Creatine is not for everyone. Check with a healthcare professional first if you:

• are pregnant or breastfeeding;
• are under 18;
• have a kidney or liver condition, or take regular prescription medication.

And always choose a product that lists its creatine content clearly and is tested for contaminants such as heavy metals.

Products mentioned in this article

FAQs

Does creatine cause hair loss?

There is no good evidence that it does. The idea comes from one small 2009 study that measured a hormone, not hair, and later research, including a trial that measured hair directly, found no difference compared with placebo.

How much weight will I gain on creatine?

Many people gain around 0.5–2 kg in the first few weeks, mostly water stored inside muscle. Skipping the loading phase makes the change more gradual.

Is creatine bad for your kidneys?

Studies in healthy adults at recommended doses have not shown kidney harm. Creatine can raise creatinine on a blood test, so tell your doctor you take it. Anyone with a kidney condition should get medical advice first.

Should I take creatine on rest days?

Yes. Daily intake keeps muscle stores saturated. Timing matters far less than consistency.

Powder or tablets: which is better?

Both deliver creatine monohydrate. Powder is usually cheaper per gram, while tablets are more convenient for travel or for people who dislike mixing drinks.

Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle.