Creatine: what it actually does (and what it doesn't)

What it actually is

Creatine isn't a steroid, a hormone, or a stimulant. It's a compound your body already makes, and it's in food you already eat, mostly red meat and fish. It sits in your muscles as a small, fast-access energy reserve.

Think of it like this. Your muscles have a very quick fuel tank they use for short, hard efforts, the first few seconds of a sprint or a heavy set. That tank is small and it empties fast. Creatine is what refills it. Take more in, and the tank gets a bit bigger and refills a bit quicker.

That's the entire mechanism. Everything else creatine is credited with flows downstream from that one fairly modest thing.

What it genuinely does

It lets you do slightly more work. This is the real effect, and it's well established. You get maybe an extra rep or two, or you recover a bit faster between sets. That's it. That's the whole benefit at the point of use.

But here's why it adds up. Slightly more work, session after session, month after month, is exactly how muscle gets built. Over a year, that small edge compounds into a real difference in strength and muscle. Creatine doesn't build anything itself. It lets you build more.

It's likely helpful for keeping muscle as you age. This is the part I find most interesting for the people reading this newsletter. Combined with resistance training, creatine appears to help older adults hold onto muscle and strength. Not on its own, and not instead of the training, but as a useful addition to it.

There's early, genuinely promising work on the brain. Your brain uses creatine too, and there's research suggesting it may help with mental fatigue, particularly when you're sleep-deprived or stressed. I'd file this as interesting rather than settled. The studies are smaller, the effects are modest, and the people confidently telling you it will fix your brain fog are running well ahead of what we actually know.

It works for most people, but not all. Somewhere around a quarter to a third of people don't respond much, usually because their muscles are already fairly well stocked, often from eating a lot of meat and fish. That's not a defect. It just means you were already there.

What it doesn't do

This is the part the pastel tubs leave out.

It doesn't burn fat. Not directly, not indirectly, not in any meaningful sense. If a product is marketing creatine on fat loss, that's marketing.

It doesn't do anything if you're not training. This is the big one. Creatine's job is to let you do more work. If you're not doing any work, there's nothing for it to amplify. Taking creatine without resistance training is like buying a bigger fuel tank for a car you keep in the garage.

It doesn't replace protein. They do completely different jobs. Protein is the raw material your muscle is made of. Creatine just helps you earn the signal to build it. A person eating 55 grams of protein a day and taking creatine is spending money to sharpen a tool while the workbench is empty.

It isn't fast. The scale often goes up a pound or two in the first week or two, and every time, someone panics. That's water being pulled into your muscle cells, which is part of how it works, not fat. The real strength effect takes weeks.

The worries, honestly addressed

Does it damage your kidneys? In healthy people, this has been studied a great deal and repeatedly not found. The myth comes from a blood marker called creatinine, which creatine raises slightly and which doctors use to check kidney function. So the reading changes without the kidney doing anything wrong. If you have existing kidney disease, that's a real conversation to have with your doctor, not a newsletter.

Does it cause hair loss? This one traces back to a single small study from 2009 that found a change in a related hormone, in twenty rugby players, and did not actually measure any hair. It has never been replicated. It's been repeated online for fifteen years anyway. There's currently no good evidence for it.

Does it make you bloated? The water goes into your muscle cells, not under your skin. Some people notice a small change in the first fortnight. Most notice nothing.

Is it safe for women? Yes, and the research on women over 40 is honestly some of the more encouraging work in this area, particularly for maintaining strength.

If you're going to take it

Three sentences of practical advice and then we'll move on.

Buy creatine monohydrate, the plain original form. It's the one with basically all of the research behind it, and it's the cheapest by a distance. The fancier versions cost more and have never convincingly beaten it.

Three to five grams a day, which is one small scoop. No loading phase needed, that just gets you there a bit faster. Time of day doesn't matter, so take it whenever you'll remember.

And expect very little at first. This is a slow, quiet, compounding thing, not something you feel.

The part that actually matters

Here's where I want to land this, because it's the honest bottom line.

Creatine is one of maybe three supplements with genuinely strong evidence behind it. That's real, and I'm not talking you out of it.

But it is the last five percent.

The other ninety-five is asking your muscles to work a few times a week, eating enough protein to give your body something to build with, and sleeping properly. Someone doing all three of those and skipping creatine will be in dramatically better shape than someone taking creatine and doing none of them. It isn't close.

And I mention this because the supplement is the easy part. Buying a tub takes four minutes and feels like progress. That's exactly why people reach for it first, and why the industry is built the way it is.

The unglamorous stuff, the protein at breakfast, the three short sessions a week, is what actually changes your body. Creatine just makes that work go slightly further.

So here's your week

Forget the tub for a moment. This week, sort the foundation instead.

Do one resistance session, twenty minutes is plenty, and get 30 grams of protein into your breakfast. That's the whole assignment. Two things, once each.

If you do those consistently for a month and then want to add creatine on top, you'll actually get something out of it. Do it the other way around and you'll be paying for an edge on work you aren't doing.

Where most people fall down

It won't be the training. Twenty minutes is doable, and you already know that.

It'll be the protein, because hitting enough of it every single day requires something the supplement industry can't sell you, which is a bank of meals you can actually be bothered to make. One good high-protein breakfast isn't enough. You need enough of them that you're not bored by Thursday, plus lunches, plus the snacks and the sweet things that quietly make up the last chunk of your day.

That's exactly what The Complete Healthy Eating Bundle is. Six guides covering breakfasts, lunches, dinners, snacks, smoothies and desserts, and every single idea in it is built around protein. It's the deciding, already done, for every meal slot you've got.

A tub of creatine is a rounding error on top of a good diet. This is the diet part.

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Foundation first. Then the fine-tuning.

Talk soon, The Healthy Mail 💪

P.S. Notice what today's email really said. The supplement everyone's arguing about is worth maybe five percent, and the ninety-five percent is protein and a few short sessions a week. That's genuinely good news, because it means the thing that decides how strong and capable you are in your 50s and 60s is entirely in your hands and costs nothing but knowing what to eat. The Complete Healthy Eating Bundle is that part solved, every meal already worked out, all of it protein-first, so hitting your number stops being something you have to think about. It's 70% off with code 2026 right now, and it costs a fraction of a year's worth of supplements you'd probably never have needed. 👉 Grab it here

P.P.S. P.S. — Struggling to hit your protein without living in the kitchen? My new video shows exactly how to reach 100g a day on your busiest days — meat-eater or plant-based. Give it a watch 👉 Watch here