Creatine works for women — here's what 69 studies and a 2-year RCT of 237 women actually found

Creatine isn't a men-only supplement

Almost every piece of gym lore around creatine assumes the person taking it is a guy trying to get bigger. That's just not what the research shows.

A 2025 systematic review and meta-analysis — 69 studies, 1,937 participants — found that creatine plus resistance training produced significant improvements in bench press strength, squat strength, vertical jump, and peak power compared to a placebo. Those results weren't men-only (Kazeminasab et al., 2025).

And a separate 2-year RCT — an experiment where 237 postmenopausal women were randomly split into a creatine group and a placebo group — found creatine preserved key structural properties of the femur, the thigh bone, during a training programme. That's a meaningful finding for long-term health (Chilibeck et al., 2023).

So where did the 'it's for men' idea come from? Mostly marketing. Let's go through what the data actually says.

What creatine actually does inside your body

Creatine is a compound your body makes naturally, mostly stored in muscle. Its job is to rapidly recharge the energy your muscles burn during short, hard efforts — think a heavy set of squats or a sprint.

When you supplement with it, you top up those stores above their normal level. The result: you can do slightly more work before fatigue kicks in. Over weeks and months, that extra work adds up to more strength and more muscle.

The 2025 meta-analysis put a number on it: creatine plus resistance training added 1.43 kg to bench and chest press strength and 5.64 kg to squat strength, versus placebo (Kazeminasab et al., 2025). A 5.64 kg improvement in squat strength from a supplement that costs a few dollars a month is a real edge.

It also improved vertical jump height by 1.48 cm and peak power output by 47.81 Watts on a Wingate test — a maximal cycling sprint — versus placebo (Kazeminasab et al., 2025). That's not a marginal rounding error. That's a real performance boost.

Creatine plus resistance training added 5.64 kg to squat strength versus placebo — across 69 studies.

— Kazeminasab et al. (2025). The Effects of Creatine Supplementation on Upper- and Lower-Body Strength and Power. Nutrients.

Older women get extra benefits — especially for bone

Here's the finding most women never hear about.

The 2-year RCT by Chilibeck et al. (2023) enrolled 237 postmenopausal women, average age 59. Half took creatine (0.14 g per kg of bodyweight per day — roughly 8–10 g for most women). Half took a placebo. Both groups did resistance training 3 days per week and walked 6 days per week.

After 2 years, creatine didn't significantly change bone mineral density — how dense the bone is — at the hip or spine. But it did maintain something else: section modulus and buckling ratio at the narrow part of the femoral neck.

Those are geometric properties of bone. In plain terms: section modulus tells you how resistant a bone is to bending; buckling ratio tells you how likely the outer shell of the bone is to collapse under load. Both got worse in the placebo group. The creatine group held steady.

After menopause, estrogen drops sharply. Estrogen normally protects bone. Creatine didn't replace that protection entirely — but it preserved structural properties that affect fracture risk, over a full two years (Chilibeck et al., 2023).

That's a benefit you won't find on the label of a creatine tub, because the supplement industry barely talks about it. But it's in a peer-reviewed RCT in Medicine & Science in Sports & Exercise, one of the top journals in the field.

After 2 years, creatine maintained femoral bone structural properties that the placebo group lost — in 237 postmenopausal women.

— Chilibeck et al. (2023). A 2-yr Randomized Controlled Trial on Creatine Supplementation during Exercise for Postmenopausal Bone Health. Med Sci Sports Exerc.

Creatine also helps older women hold onto muscle

The muscle-loss problem doesn't start at 70. It starts quietly in your 30s and accelerates after menopause. Creatine is one of the few supplements with clear evidence it slows that process.

A systematic review and meta-analysis of 22 RCTs — 721 older adults, men and women combined, mean age 57–70 — found that creatine plus resistance training produced 1.37 kg more lean tissue mass than placebo (Chilibeck et al., 2017). It also improved chest press strength (standardised mean difference = 0.35) and leg press strength (standardised mean difference = 0.24) versus placebo.

A standardised mean difference — a way researchers compare effects across studies that use different scales — of 0.24 to 0.35 is a small but consistent, meaningful effect. Not enormous. But real, and replicated across 22 separate studies.

For a woman in her 50s or 60s doing 2–3 resistance sessions a week, 1.37 extra kg of lean mass and measurably better leg strength is the kind of difference that matters for how you feel and function — not just in the gym, but day to day.

Creatine plus resistance training added 1.37 kg of lean tissue compared to placebo — across 22 RCTs in older adults.

— Chilibeck et al. (2017). Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults. Open Access J Sports Med.

What about bloating and water retention?

This is the #1 reason women say they avoid creatine. Worth taking seriously.

Creatine does draw water into muscle cells. That's actually part of how it works — the extra intracellular fluid is linked to muscle protein synthesis signals. But there are two important points here.

First: the water goes into the muscle, not under the skin. It's not the same as feeling puffy or soft. Most people can't see or feel it.

Second: the studies above — including the 2-year RCT with 237 women — used creatine continuously for months and years without reporting water-retention side effects as a significant problem. The initial gain of 0.5–1 kg of scale weight in the first week is water in muscle. After that, you're building actual strength and lean tissue on top of it.

If bloating is a concern, skipping the loading phase (20 g/day for 5–7 days, which some older protocols recommend) removes most of the acute water-retention effect. Just take 3–5 g per day from day one and you'll reach the same saturation in 3–4 weeks with a much smoother curve.

Practical use: dose, timing, and what to pair it with

The research is pretty consistent on the basics.

Dose: 3–5 g of creatine monohydrate per day is the standard maintenance dose across the studies reviewed here. Chilibeck et al. (2023) used 0.14 g per kg of bodyweight per day — for a 65 kg woman, that's about 9 g. Higher doses appear in some older-adult studies because older muscle takes up creatine less efficiently. If you're under 40, 3–5 g is fine.

Timing: It doesn't matter much. The body doesn't use it acutely like caffeine — it's about saturating your muscle stores over time. Post-workout may offer a small edge because blood flow to muscle is elevated then, but the difference is minor. Pick a time you'll actually remember.

What it needs to work: Resistance training. The 2025 meta-analysis found the benefits were largest when creatine was paired with exercise — not taken in isolation (Kazeminasab et al., 2025). Creatine gives your training a higher ceiling. It doesn't replace the training itself.

Form: Creatine monohydrate. It's the most studied form, the cheapest, and the one every RCT above used. There's no strong evidence that creatine HCl, buffered creatine, or other variants outperform it. Save your money.

If you want to understand how to pair this with a progressive overload training approach, the compounding effect of a better stimulus plus creatine is where the real gains come from.

How Planfit applies this

Creatine raises your ceiling — but only if your training actually pushes you toward it. Planfit tracks your load across every session and nudges the weight up when your current weight stops challenging you. That's the progressive overload that the 2025 meta-analysis found creatine works best alongside.

Every session, Planfit recommends a target weight and rep range per exercise, logs your sets, and shows you your progression trend over time. So when creatine starts translating into real strength gains — usually around weeks 3–4 — the app catches it and keeps pushing the stimulus forward.

[Try Planfit free →]