Supplements

Creatine: The Complete Science-Based Guide

1) What creatine actually does

Creatine is a compound your body already makes and stores mostly in muscle, where it helps regenerate ATP — the energy currency for short, explosive efforts. Supplementing raises your muscle creatine stores, so you can squeeze out an extra rep or two and produce slightly more force. Over weeks and months, that extra training volume adds up to measurable gains in strength and muscle. It is one of the very few supplements with overwhelming evidence behind it.

2) How much to take

The simple protocol is 3–5 grams of creatine monohydrate per day, every day — training day or not. That's it. You can optionally "load" with about 20 g/day (split into 4 doses) for 5–7 days to saturate your muscles faster, then drop to 3–5 g. Both approaches reach the same muscle saturation; loading just gets you there in a week instead of three to four.

Approach	Protocol	Time to full effect
No-load (recommended)	3–5 g/day	~3–4 weeks
Loading	20 g/day × 5–7 days, then 3–5 g/day	~1 week

3) Timing: does it matter?

Barely. Studies show only a small possible edge to taking creatine near your workout versus other times. What truly matters is taking it consistently every day so your muscle stores stay topped up. Pick a time you'll remember — with breakfast, in a shake, or post-workout — and stick to it.

4) Which form should you buy?

Creatine monohydrate. Fancier forms (HCl, buffered, "ester") are more expensive and have no proven advantage. Look for a plain monohydrate, ideally Creapure-certified for purity. Powder is cheaper than capsules and dissolves fine in water or juice.

5) Side effects and safety

For healthy adults, 3–5 g/day is safe for long-term use and has been studied for decades. The most common "side effect" is a small amount of water retention inside the muscle. Some people get mild stomach discomfort if they take a big dose on an empty stomach — splitting the dose or taking it with food fixes that. Creatine does not damage healthy kidneys, but if you have existing kidney disease, check with your doctor first.

6) Who benefits most?

• Anyone doing resistance training: the classic use case — more strength and muscle.
• Power and team-sport athletes: better repeated sprint and jump performance.
• Vegetarians and vegans: often start with lower stores, so they may see a bigger jump.
• Older adults: emerging evidence for muscle and possibly cognitive support alongside training.

Creatine works best when the rest of your nutrition is dialled in — especially protein and total calories. KeplerFit can estimate both from a photo of your meal, so you can make sure your training and supplements aren't being wasted by under-eating protein. See how it works →

7) Creatine for women

This is the most common question we get, and the honest answer is that the research does not support most of the worries.

• It will not make you bulky. Creatine does not add muscle by itself — it lets you train slightly harder. Building visible muscle mass still requires years of progressive training and a calorie surplus.
• Women often start with lower muscle creatine stores than men, partly due to lower dietary intake from red meat and fish, so the relative jump can be meaningful.
• The dose is the same: 3-5 g per day. It is not scaled by body weight in any practical sense.
• The scale will move up 1-2 kg in the first fortnight. That is water drawn into the muscle, not fat and not subcutaneous puffiness. If you track weight, expect this and do not react to it.

If you are pregnant or breastfeeding, there is not enough research to recommend it — speak to your doctor.

8) Does creatine cause hair loss?

Short answer: there is no good evidence that it does.

The concern traces back to a single small 2009 study on rugby players which found a rise in DHT, a hormone associated with male-pattern baldness in people genetically predisposed to it. That study measured a hormone, not hair. It has not been replicated, and later reviews looking specifically at creatine and hair have not found an effect.

What is fair to say: if you already carry the genes for male-pattern baldness, the theoretical mechanism is not impossible — but a single unreplicated hormone measurement is a thin basis for avoiding the most well-evidenced supplement in sport. Most people can stop worrying about this one.

9) Bloating and water retention — what actually happens

Creatine pulls water into muscle cells. That is part of how it works, not a side effect to be managed away.

What people call "creatine bloat" is usually one of two things:

• Intramuscular water. Muscles look slightly fuller. Most people consider this a cosmetic positive.
• Genuine gut bloating, which is almost always caused by taking a large loading dose at once on an empty stomach. Splitting the dose, taking it with food, or simply skipping the loading phase resolves it.

Skipping the loading phase avoids nearly all of the complaints. You reach the same saturation in 3-4 weeks instead of 1.

10) Practical questions people actually ask

• Does coffee cancel it out? No. An old study raised the question but the effect has not held up. Taking creatine with your morning coffee is fine.
• Does it break a fast? Plain creatine monohydrate has essentially no calories, so for fasting aimed at weight management it is not a problem. Check the label — flavoured or sweetened blends may contain sugars. See our guide to fasting and NHS guidance.
• What should I mix it with? Anything. Water is fine. It does not need juice or a "carb spike" to be absorbed.
• Do I still take it on rest days? Yes. The point is keeping muscle stores saturated, not timing it around a session.
• Should I take it while trying to lose fat? Yes — helping you retain strength and muscle in a calorie deficit is arguably when it matters most. Expect the scale to sit 1-2 kg higher than it otherwise would; judge progress by measurements and by the mirror, not by that number.
• What if I miss a day? Nothing happens. Muscle stores deplete over weeks, not hours. Take your normal dose the next day.

11) How long until you notice anything?

Expect roughly this timeline on 3-5 g/day without loading:

Creatine does not produce a feeling. If you are waiting for a sensation the way you would with caffeine, you will conclude it is not working. Judge it by your training log instead.

FAQ

How much creatine should I take?

3–5 grams of creatine monohydrate per day, every day. A loading phase of 20 g/day for 5–7 days saturates muscles faster but is optional; you reach the same level either way.

Do I need to load creatine?

No. Loading just fills your muscle stores faster (about a week vs 3–4 weeks). The end result is identical, so most people simply take 3–5 g daily.

Is creatine safe?

Creatine monohydrate is one of the most studied supplements and is considered safe for healthy adults at 3–5 g/day for long-term use. If you have kidney disease, consult your doctor first.

Does creatine cause weight gain?

You may gain 1–2 kg in the first weeks, but this is water drawn into your muscles, not fat. It often makes muscles look fuller.

When is the best time to take creatine?

Timing has a very small effect. Daily consistency matters far more. Taking it around your workout or with a meal is fine.

Is creatine safe for women?

Yes, at the same 3-5 g per day dose. It will not make you bulky — creatine lets you train slightly harder, it does not add muscle by itself. Women often start with lower muscle creatine stores, so the relative benefit can be meaningful. Expect the scale to rise 1-2 kg in the first fortnight; that is water inside the muscle, not fat. If you are pregnant or breastfeeding, speak to your doctor as the research is insufficient.

Does creatine cause hair loss?

There is no good evidence that it does. The concern comes from a single small 2009 study on rugby players that measured a rise in DHT, a hormone linked to male-pattern baldness. That study measured a hormone, not hair, and it has not been replicated. Later reviews looking specifically at creatine and hair have not found an effect.

Why does creatine cause bloating, and how do I avoid it?

Creatine draws water into muscle cells, which is part of how it works. Genuine gut bloating is almost always caused by taking a large loading dose at once on an empty stomach. Splitting the dose, taking it with food, or skipping the loading phase entirely resolves it. Without loading you reach the same saturation in 3-4 weeks instead of 1.

Should I take creatine on rest days?

Yes. The goal is keeping muscle stores saturated rather than timing it around a session. Take 3-5 g every day, training or not. If you miss a day nothing happens — stores deplete over weeks, not hours.

Does coffee or caffeine cancel out creatine?

No. An older study raised the question but the effect has not held up in later research. Taking creatine with your morning coffee is fine.

How long does creatine take to work?

On 3-5 g per day without loading: weeks 1-2 the scale rises 1-2 kg from water with usually no performance change, weeks 3-4 muscle stores saturate and you may get an extra rep or two on hard sets, and by month 2-3 the accumulated training volume shows as strength. Creatine does not produce a noticeable sensation — judge it by your training log, not by how you feel.

Can I take creatine while trying to lose fat?

Yes, and it arguably matters most then, because it helps you retain strength and muscle in a calorie deficit. Expect the scale to sit 1-2 kg higher than it otherwise would due to intramuscular water, so judge progress by measurements rather than by weight alone.

How much creatine should I take?

3–5 g of monohydrate daily. Loading (20 g/day for a week) is optional and reaches the same level faster.

Do I need to load or cycle?

No to both. Daily 3–5 g works; no breaks needed.

Does creatine cause weight gain?

A small early gain (1–2 kg) is water inside the muscle, not fat.

Is creatine safe?

Yes, for healthy adults at 3–5 g/day long term. With kidney disease, ask your doctor.