The short version
Creatine monohydrate is the reference form: the most extensively studied, clinically effective, and the least expensive per gram. Its benefit for strength, power and repeated high-intensity effort — with training — is among the best-supported findings in all of sports nutrition.
The label test is mostly about not overpaying: look for “creatine monohydrate,” a real 3–5 g serving, and a sane price per gram. “Buffered,” HCl, ethyl-ester and “10× absorption” versions have not been shown to beat monohydrate, and usually cost several times more.
What it actually is
Creatine is a compound your body makes (from amino acids) and gets from meat and fish; about 95% is stored in muscle as phosphocreatine. During brief, intense efforts, phosphocreatine rapidly regenerates ATP — the muscle’s immediate energy currency — which is why supplementing raises your capacity for short, hard work.
The overwhelming majority of research uses creatine monohydrate, which sports-nutrition authorities describe as the most effective form. Alternatives are marketed constantly — creatine HCl, “buffered” (Kre-Alkalyn), ethyl ester, liquid, magnesium chelate — but none has been shown to raise muscle stores or performance better than monohydrate, and several are unproven or worse. Monohydrate is also the cheapest.
“Micronized” just means finer particles that mix more easily — same molecule. Creatine is sold as plain powder, capsules, gummies, and as a (often under-dosed) ingredient in pre-workout blends.
What the research actually shows
We label each use by how strong the evidence is — well-established, mixed, or weak/preliminary — and say plainly where marketing outruns the science.
Well-established Strength, power & high-intensity performance. This is the flagship effect: better performance in repeated short, intense efforts and greater strength and power gains when paired with resistance training. Very well supported across many trials.
Well-established Lean body mass with training. Increases lean mass and training adaptations; some early gain is water drawn into muscle, with additional muscle over time alongside training. It is not fat gain.
Mixed Cognition / memory. A 2024 meta-analysis found a modest benefit for memory and smaller, low-certainty effects on processing speed — stronger in stressed or sleep-deprived states. Promising, but broad “brain-boosting” claims outrun the data.
Weak / preliminary Endurance / steady-state aerobic performance. Little direct benefit for steady endurance; any effect is indirect.
The doses studies actually used
Two evidence-based protocols work. Loading + maintenance: about 20 g/day (split into four doses) for 5–7 days to saturate muscle fast, then 3–5 g/day to maintain. No-load: just 3–5 g/day reaches the same saturation over roughly 3–4 weeks — gentler on the stomach, only slower.
Total daily intake and consistency matter far more than timing (pre- vs post-workout is a minor variable). Long-term studies support doses up to about 30 g/day, and in healthy people research spanning years has not shown kidney harm.
What to look for on a label
Where you’ll find it in what we’ve reviewed
Creatine isn’t in the products we’ve reviewed so far — our early coverage centered on hydration, colostrum, greens and collagen — so we’re not going to fake a cross-link. It’s on the list for a dedicated roundup.
In the meantime, the label test above is the whole game: the science is settled enough that your only real job is buying monohydrate at a fair price and ignoring the premium forms. Browse the full review index or get each new report as it publishes.
Frequently asked questions
Do I need to load creatine?
No. Loading (~20 g/day for a week) saturates muscle faster, but 3–5 g/day gets you to the same place in 3–4 weeks. Loading can cause more initial water weight and occasional stomach upset.
Is creatine bad for my kidneys?
In healthy people, research up to ~30 g/day for as long as five years hasn’t shown kidney harm. It can transiently raise blood creatinine (a byproduct) on a lab test without indicating damage. People with existing kidney disease should consult a clinician.
Is an expensive form better than monohydrate?
Generally no. Monohydrate is the most studied and effective form; “buffered,” HCl and ethyl-ester versions haven’t been shown to outperform it and usually cost more.
Will it make me gain weight?
Often a small increase early on, mostly water drawn into muscle, plus lean mass over time with training. It is not fat gain.
Sources
- ISSN Position Stand — Safety and Efficacy of Creatine Supplementation (Kreider et al., JISSN): monohydrate as most effective form, dosing, safety. pmc.ncbi.nlm.nih.gov/articles/PMC5469049/
- NIH Office of Dietary Supplements — Dietary Supplements for Exercise and Athletic Performance (well-established strength/power benefit; standard dosing). ods.od.nih.gov/factsheets/ExerciseAndAthleticPerformance-HealthProfessional/
- Creatine and cognitive function — systematic review & meta-analysis (Frontiers in Nutrition, 2024): modest memory signal. frontiersin.org/articles/10.3389/fnut.2024.1424972/full
- Creatine dose-response & body composition — GRADE meta-analysis. pmc.ncbi.nlm.nih.gov/articles/PMC11268231/
This explainer describes what research has examined — it is not medical advice and does not prescribe. Talk to your clinician before starting any supplement, especially alongside medication. Medical disclaimer.