Creatine: the supplement that actually does what it says

Most supplements are a waste of money. A few are useful. One — creatine monohydrate — has more high-quality evidence behind it than essentially any other consumer supplement on the market.

Here is the short, honest version.

What it does (the muscle story)

Creatine increases the amount of phosphocreatine in your muscle cells. Phosphocreatine is the substrate the body uses to regenerate ATP (cellular energy currency) during the first ~10 seconds of high-intensity work. More phosphocreatine = a couple more reps, a slightly heavier set, faster repeated sprints.

Over weeks and months, that small per-session boost compounds into measurably more muscle and slightly more strength. Meta-analyses across hundreds of studies put the effect at roughly 8% more strength gains and 14% more muscle gains in trained individuals when added to a structured training program.

The cognitive story (newer, real)

In the last decade, evidence has accumulated that creatine has cognitive benefits, particularly under conditions of stress, sleep deprivation, or high mental load. Studies on:

• Sleep-deprived medical residents
• High-altitude climbers
• Vegetarians and vegans (who tend to have lower baseline creatine stores)
• Older adults with mild cognitive impairment

...all show modest but real improvements on tests of working memory, processing speed, and reaction time.

The proposed mechanism: the brain is metabolically expensive, and supplementing creatine helps maintain ATP availability under cognitive stress, much like it does in muscle.

Dose

3–5 grams a day. Pick a number, hit it daily.

You don't need to "load" with 20 g for the first week. The effect just shows up faster (within a week instead of 3–4 weeks). Most people skip loading, take 5 g/day, and get the same end state.

Form

Creatine monohydrate. That's it. Skip the hydrochloride, the buffered, the "ethyl ester," the colored powders with branding. Monohydrate is the most studied, the cheapest, and at least as effective as any of the alternatives.

Timing

It does not matter when you take it. Pre-workout, post-workout, with breakfast, with dinner — all equivalent. What matters is daily consistency, because the effect comes from saturating the muscle creatine pool over time.

Side effects

A small amount of intracellular water retention in muscle (you might see 1–2 lbs on the scale in the first 2–4 weeks; that's not fat). Otherwise, the safety profile across decades of research is excellent. Kidney concerns repeatedly raised in the lay press are not supported by the literature in healthy individuals.

If you have pre-existing kidney disease, talk to your doctor.

Who it's not for

If you don't strength train, don't play sports, don't do high-intensity work, and aren't sleep-deprived or vegetarian, the strict cost-benefit case is weaker. It still won't hurt you, but the muscle benefit assumes you're using muscles intensely.

The cost

A 1 kg tub of monohydrate is about $25 and lasts roughly 200 days at 5 g/day. 12 cents per day. The cheapest piece of useful intervention you'll find in a sports nutrition store.

What we don't claim

Creatine is not a fat burner. It does not "spike testosterone." It does not give you energy in any felt, immediate sense (it's not a stimulant). The benefits show up only with consistent use and only in domains where ATP regeneration matters.

How to add it without thinking

Buy a tub. Put 5 g in your morning coffee or your protein shake. Forget about it. Re-up when the tub runs out. That's the protocol.

Most "supplements" are caffeine plus marketing. Creatine is the rare exception that earns its shelf space.