Creatine: What It Actually Does (And What the Evidence Shows)

Creatine has the reputation of a gym-bag staple for young bodybuilders. The actual research base is much bigger than that reputation — decades deep, covering people well past their 20s, with real answers to the testosterone and hair-loss questions that keep it out of some people's routines.

Written by Vita Globe Editorial Team | Reviewed against peer-reviewed research and ISSN guidance

What Creatine Actually Does

Creatine is a compound your body already makes and stores mostly in skeletal muscle, where it helps regenerate ATP — the molecule muscles burn for quick, high-intensity effort. Supplementing raises stored phosphocreatine, which is why the proven benefit is specific: strength, power output, and performance in short, intense efforts like lifting, sprinting, or repeated sets under 30 seconds. The ISSN's formal position stand calls it the top ergogenic supplement currently available for exactly that purpose, with performance gains generally in the 10–20% range depending on how much muscle phosphocreatine rises^[1]. It is not a testosterone booster, a fat burner, or a "bulking" powder — it's an energy-system supplement with one of the largest evidence bases of anything sold as a supplement.

Not Just for Young Athletes

This is where the research has moved fastest in the past few years, because muscle loss (sarcopenia) is one of the more preventable parts of aging — and creatine plus resistance training is one of the better-studied tools for slowing it. A 2025 systematic review and meta-analysis pooled 8 randomized controlled trials covering 482 predominantly untrained, healthy older adults^[2]. Lean tissue mass increased significantly with creatine plus resistance training versus resistance training alone, with the biggest effect in the first 32 weeks of consistent use^[2]. The takeaway isn't "more is better forever" — it's that creatine amplifies a training stimulus at any adult age; it doesn't replace one.

The Testosterone & Hair Loss Question

Short answer: not meaningfully, according to the bulk of the research — but there's one older study responsible for most of the internet confusion. A small 2009 study of 20 college-aged rugby players found that three weeks of creatine loading roughly doubled the ratio of dihydrotestosterone (DHT) to testosterone, while total testosterone itself didn't significantly change^[3]. That single study is the origin of most "creatine spikes your hormones" and "creatine causes hair loss" claims still circulating, and it hasn't been well-replicated since.

The most direct test yet is a 2025 randomized controlled trial: 38 men took either creatine or a placebo for 12 weeks, with hair density and DHT measured before and after. The result: no statistically significant change in serum DHT levels or visible hair density in the creatine group^[4]. Worth being honest about the limits here: the trial didn't screen for genetic predisposition to hair loss and measured DHT in the blood rather than at the scalp specifically — a real, meaningful data point against the claim, but not a complete final answer for men already prone to male-pattern baldness.

Creatine and Brain Function

Creatine's newest research frontier is cognition, not muscle. A 2024 meta-analysis pooling 16 randomized controlled trials and 492 participants found creatine supplementation produced a real, moderate-confidence improvement in memory, plus faster attention and processing speed^[5]. It did not find significant improvement in overall cognitive function, executive function, or attention accuracy — the benefit is specific to memory and processing speed, not a general cognitive upgrade. The theorized mechanism is the same one behind creatine's muscle benefit: supporting brain energy metabolism via ATP regeneration, which matters more under strain like sleep deprivation or aging. For the full breakdown, see our deep dive on creatine and brain function.

Dosing and Safety

Two standard approaches, per the ISSN position stand^[1]: a loading protocol of about 20g/day (split into 4 doses) for 5–7 days, then a 3–5g/day maintenance dose — which saturates muscle stores faster — or a no-loading protocol of 3–6g/day from day one, reaching the same saturation over roughly 3–4 weeks, slower but easier on the stomach. Larger or high-volume-training individuals may need up to 5–10g/day at maintenance. For healthy adults, long-term studies — including multi-year use at high doses — show no clinically significant impact on kidney function^[1]. Anyone with pre-existing kidney disease should talk to a doctor first, since that specific population hasn't been well-studied.

Frequently Asked Questions

Does creatine cause hair loss?

The best current evidence — a 12-week randomized controlled trial in 38 men — found no significant change in DHT levels or hair density. The study didn't measure DHT specifically at the scalp or screen for genetic predisposition to balding, so it's a reassuring data point rather than a final answer for men already prone to male-pattern hair loss.

Does creatine increase testosterone?

Not meaningfully, based on the larger body of research. A small 2009 study found a DHT-to-testosterone ratio shift in young rugby players during a short loading phase, but total testosterone didn't significantly change in that study, and the effect hasn't been consistently replicated since.

Is creatine only for bodybuilders?

No — a 2025 meta-analysis of 8 randomized trials in older adults found creatine plus resistance training significantly increased lean tissue mass and strength, and separate research shows benefits for memory and processing speed unrelated to athletic performance.

How much creatine should I take?

3–5g/day is the standard maintenance dose used across most of the research. A loading phase (about 20g/day for 5–7 days) saturates muscle stores faster but isn't required — the no-loading approach reaches the same result over about 3–4 weeks.

Is creatine safe to take long-term?

For healthy adults, long-term studies — including multi-year use at high doses — show no clinically significant impact on kidney function. Anyone with pre-existing kidney disease should talk to a doctor first.

Sources

1. Kreider RB, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition, 2017.
2. The impact of creatine supplementation associated with resistance training on muscular strength and lean tissue mass in the aged: a systematic review and meta-analysis. European Review of Aging and Physical Activity, 2025.
3. van der Merwe J, Brooks NE, Myburgh KH. Three weeks of creatine monohydrate supplementation affects dihydrotestosterone to testosterone ratio in college-aged rugby players. Clinical Journal of Sport Medicine, 2009.
4. Lak M, et al. Does creatine cause hair loss? A 12-week randomized controlled trial. Journal of the International Society of Sports Nutrition, 2025.
5. "The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis." Frontiers in Nutrition, 2024.
6. Vita Globe. Sugar-Free Creatine Gummies — product formulation (verified against live product page).

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. The content in this article is for informational purposes only and is not a substitute for professional medical advice.