500+
Peer-reviewed studies
The single most-researched sports supplement in existence — and one of the few that clearly works.
+5–15%
Strength & power gains
With training: ~8% more max strength and ~14% more reps than the same training without it.
30 g/day × 5 yr
Shown safe
No kidney harm in healthy people at that dose for that long. The "creatinine" scare is a lab artifact.
~$5/mo
Cost at 5 g/day
Cheapest effective thing in the gym bag. Plain monohydrate is the gold standard — skip the fancy forms.
Where the Evidence Is Strong vs. Thin
PubMed
Creatine is the opposite of most supplements: for muscle, strength, and power the evidence is overwhelming and settled. For the brain it's real, newer, and smaller. For the "burns fat / boosts testosterone" claims, there's essentially nothing. Match your expectations to the right bar.
What the Strongest Evidence Shows
PubMed
Where creatine has real, measured benefit — the number is the finding, not the hope. The catch is in the fine print: creatine builds the engine, but training still does the work.
Max strength (with lifting)
+8%
More 1–10RM strength than the same training on placebo (20% vs. 12%), across 22 studies. Plus ~14% more reps; bench gains ran 3–45%.
→ Rawson & Volek, J Strength Cond Res 2003 · PMID 14636102
Lean muscle mass
+1–2 kg
Extra fat-free mass over training alone in a 100-study meta-analysis — real muscle built over weeks, biggest for upper-body and short, hard efforts.
→ Branch, Int J Sport Nutr Exerc Metab 2003 · PMID 12945830
Older women + training
+7.5 kg
Leg-press 1RM gain (and +0.37 kg lean mass) with ≥5 g/day plus resistance training, in postmenopausal women avg. age 62. Renal markers unchanged. Not just for young men.
→ Naddafha et al., J Int Soc Sports Nutr 2026 · PMID 42141930
Sleep-deprived brain
1 Dose
A single large dose (0.35 g/kg) improved processing speed and working memory through 21 hours without sleep — the frontier where the brain research is most striking.
→ Gordji-Nejad et al., Sci Rep 2024 · PMID 38418482
The Myths — What the Evidence Actually Says
PubMed
No supplement carries more stubborn folklore than creatine. An internationally renowned expert panel went through the big ones point by point. Here's what survives contact with the data — spoiler: not much.
Myth: wrecks your kidneys
Kidney damage
eGFR: 0 change
A 2026 meta-analysis of 20 RCTs: blood "creatinine" rises a touch (+0.13 mg/dL) because creatine itself breaks down into it — but urea and real filtration (eGFR) don't move. The lab number looks off; the healthy kidney is fine.
→ Tsiaras et al., J Ren Nutr 2026 · PMID 42035842
Myth: it's basically a steroid
"It's a steroid"
0 hormones
Creatine is an amino-acid compound your own body makes (~1 g/day) and you eat in red meat and fish. It has no steroid structure and no anabolic-hormone action. Different universe from steroids.
→ Antonio et al., J Int Soc Sports Nutr 2021 · PMID 33557850
Myth: makes your hair fall out
Hair loss / baldness
1 study, 0 hairs
The entire myth rests on one 2009 rugby study where the hormone DHT rose 56%. It never measured actual hair — and in 15+ years no study has shown creatine causes baldness.
Myth: it's just water bloat
"Just water weight"
In the muscle
The early couple of pounds is water pulled into muscle cells (intracellular) — that's part of how it works, not the puffy under-the-skin bloat people picture. Long term, the gain is real muscle.
→ Antonio et al., J Int Soc Sports Nutr 2021 · PMID 33557850
Myth: you have to "load"
Loading is mandatory
Optional
Loading (20 g/day for 5–7 days) only fills your muscle stores faster. Just 3–5 g/day gets you to the exact same place in 3–4 weeks. Skip the load if big doses upset your stomach.
→ Antonio et al., J Int Soc Sports Nutr 2021 · PMID 33557850
Myth: fancier forms are better
"Advanced" forms win
Monohydrate wins
HCl, buffered, ethyl-ester and liquid versions cost more and none has beaten plain monohydrate head-to-head. Monohydrate is the most-studied, cheapest, and the gold standard.
→ Antonio et al., J Int Soc Sports Nutr 2021 · PMID 33557850
The Evidence Table
PubMed
The honest ledger — the foundational efficacy and safety studies, the newer frontiers, and the single study that launched the hair-loss myth. Most supplements would kill for a table this green.
| # | Study | Type | n | What it found |
|---|---|---|---|---|
| 1 | ISSN position stand: safety & efficacy of creatine |
Position stand / review | — | Safe & effective |
| 2 | Creatine + resistance training on strength |
Review 22 studies | — | Positive |
| 3 | Creatine on body composition & performance |
Meta-analysis 100 studies | — | Positive |
| 4 | Creatine & lower-limb strength |
Meta-analysis 60 RCTs | 1,297 | Positive |
| 5 | Creatine & kidney function |
Meta-analysis 20 RCTs | — | No harm |
| 6 | Creatine in postmenopausal women |
Meta-analysis 7 RCTs | 608 | Positive |
| 7 | Creatine & cognition in healthy people |
Systematic review 6 RCTs | 281 | Promising |
| 8 | Single-dose creatine during sleep deprivation |
RCT (crossover) | 15 | Positive |
| 9 | Creatine & the DHT:testosterone ratio (the "hair" study) |
RCT (crossover) | 20 | Myth source |
| 10 | Creatine as an add-on in depression |
Narrative review | — | Early / promising |
Reality check: creatine is the rare supplement where the evidence is overwhelming, consistent, and boring — in a good way. The honest caveats: it builds the engine, training does the driving (creatine without lifting does little), and roughly 20–30% are "non-responders" — often heavy red-meat eaters whose muscles are already near-saturated.
Cost vs. the Rest of the Supplement Shelf
Market data
Here's the kicker: the supplement with the most evidence is also the cheapest. Everything pricier on the shelf either does a different job or has far thinner support. Approx. U.S. prices, ~30-day supply.
Most evidence
Creatine monohydrate
~$5
per month (~$0.15 / 5 g serving)
Works · cheap · safe
No proven edge
"Advanced" forms (HCl / buffered)
$20–40
per month
Pricier, no head-to-head win
Dosing Reality
ISSN / Clinical
It's genuinely simple: a small daily scoop, forever. The only thing that matters more than dose is consistency — the benefit comes from keeping your muscles topped up, not from any one dose.
Standard
5 g/day
Plain monohydrate, every day, any time. The whole protocol for most people.
Loading (optional)
20 g/day × 5–7 d
Four 5 g doses through the day — saturates muscle ~1 week faster, then drop to 5 g
Bigger athletes
up to ~0.1 g/kg
~7–10 g/day for large/heavier lifters maintaining more muscle mass
Brain (emerging)
5–10 g/day
Higher doses studied for cognition; up to 0.35 g/kg single dose in sleep-deprivation research
What matters
Form = monohydrate
Skip the "advanced" forms. Take with water; the mild early water-weight is inside the muscle, not bloat.
Sources: ISSN position stand 2017 · Antonio et al. 2021
Legal & Regulatory Position
T1 · Regulatory
Unlike most things in our library, there's no controversy here — creatine is a legal, freely sold supplement that no major sports authority bans. The only real to-do is buying a clean, third-party-tested brand.
FDA
Legal dietary supplement
Sold freely in the U.S. as a dietary supplement (not an "approved drug," but backed by decades of safety data). Supplements aren't pre-approved for purity — so buy NSF Certified for Sport or Informed Sport tested.
WADA / USADA / NCAA
Permitted — not banned
Creatine is not on the WADA prohibited list and is allowed in essentially all sports. (One quirk: NCAA rules bar member schools from providing it to athletes, but athletes may use it on their own.)
Your body & diet
You already make ~1 g/day
Your liver and kidneys synthesize about 1 g of creatine daily, and red meat & fish add roughly 1–2 g more. Supplementing just tops the tank from ~80% to ~95% full — which is where the performance edge comes from.
What the Community Reports
Anecdotal
This section is anecdotal. These are community and gym-floor reports — not controlled, not blinded, not weighed as evidence. They're included because they line up neatly with what the research already shows.
Near-universal gym staple
The default pick
More lifters report using creatine than any other supplement. The typical review is boring on purpose: "cheap, it works, no drama." That matches the research better than almost any product.
Non-responders (~20–30%)
"I feel nothing"
A real minority — often heavy red-meat eaters already near-saturated — notice little. Vegetarians and vegans, who start lower, usually report the biggest difference.
→ Antonio 2021 · PMID 33557850
Stomach gripes on big doses
Loading = bloat
The one consistent complaint: 20 g at once can cause bloating or cramps. The community fix is the same as the science says — split the dose or skip loading and just take 5 g/day.
→ Antonio 2021 · PMID 33557850
Side Effects & Who Should Be Careful
Safety
One of the most-studied supplements ever — and most of its "dangers" are myths. Here's the honest list of what's real.
Common side effects
GI & water
Stomach upset or bloating if you take a big dose at once — fixed by splitting it or just using 3–5 g/day. Early weight gain is water pulled into the muscle, not bloat.
The kidney "danger"
A myth
In healthy people, creatine does not harm the kidneys — a 20-RCT review found it raises a lab marker (creatinine) without changing actual kidney function. Safe up to 30 g/day for 5 years in studies.
Ask your doctor first if…
Kidney disease
If you have pre-existing kidney disease, check with your doctor before supplementing (a precaution, since creatinine readings shift). Stay hydrated. Otherwise it's safe for healthy adults long-term.
The honest safety bottom line: creatine monohydrate is one of the safest supplements there is — the kidney/liver/"it's a steroid"/hair-loss fears are myths in healthy people. The only genuine "check first" is if you already have kidney disease. Stick to 3–5 g/day and stay hydrated.
The Bottom Line — In Plain English
What it is
A compound your body makes from amino acids and stores in muscle as phosphocreatine — the fast-recharge battery for your cells' energy system (ATP). You also get it from red meat and fish.
What the research shows
Rock-solid for strength, power, and muscle when you train. Emerging and promising for the brain (memory, sleep-deprived focus, aging). Weak-to-none for fat loss or testosterone.
How to use it
5 g of plain monohydrate, every day. Loading is optional. Timing barely matters; not skipping does. Skip the fancy "advanced" forms — they cost more and do no more.
Legality
A legal dietary supplement sold everywhere, and not banned by WADA, USADA, or in WADA-governed sport. Pick a third-party-tested brand for purity.
The honest verdict
The most-proven, cheapest, and safest supplement in the gym. The kidney, hair-loss, and "it's a steroid" scares don't hold up — but it builds the engine; training still does the work.
- Creatine + training adds about 8% strength and 14% more reps over training alone — and it works for women and older adults too, not just young men.
- The kidney scare is a measurement quirk: blood creatinine ticks up, but real filtration (eGFR) and urea don't change in healthy people.
- The hair-loss myth traces to ONE 2009 study that measured a hormone (DHT), not hair — and no study has ever shown creatine causes baldness.
- It's not a steroid: it's an amino-acid compound your body already makes about 1 g of every day.
- Plain monohydrate (~$5/month) beats every "advanced" form — none has out-performed it head-to-head.
- Roughly 20–30% are "non-responders" (already saturated), and creatine without training does little — it's a training aid, not magic.