Creatine is the most studied supplement in sports science, with hundreds of randomized controlled trials, consistent findings across multiple outcomes, and several decades of safety data in healthy populations.
Here’s what the research shows.
What Creatine Actually Does
Your muscles store energy as ATP (adenosine triphosphate). During high-intensity efforts — a max squat set, a sprint — ATP depletes within seconds. Your body regenerates it using a molecule called phosphocreatine, stored in muscle tissue.
Creatine supplementation increases the phosphocreatine pool in your muscles by 20–40%. More phosphocreatine = faster ATP regeneration = more reps before fatigue sets in on high-intensity efforts.
The practical result: you can do more work per session. An extra rep or two on each set, across a full workout, across weeks and months, compounds into significantly greater volume — which drives greater hypertrophy and strength gains.
A meta-analysis of 22 studies (Lanhers et al., 2017) found creatine supplementation produced an average 8% increase in strength and 14% increase in power output compared to placebo.
The Secondary Benefits
Beyond the gym, the research on creatine is expanding:
Cognitive function — Several studies show improved working memory and processing speed, particularly under sleep deprivation or high mental load. The mechanism is similar: creatine supports ATP regeneration in neurons.
Muscle preservation with age — Creatine combined with resistance training significantly reduces age-related muscle loss (sarcopenia). Evidence is strong enough that researchers now recommend it specifically for older adults.
Recovery — Some evidence suggests creatine reduces muscle damage markers post-exercise, though this is less consistent than the strength/power data.
Which Form to Buy
Creatine monohydrate. Not creatine HCl, ethyl ester, buffered creatine, or any “advanced” formulation. These alternatives have less research, cost more, and provide no demonstrated benefit over monohydrate.
Creatine monohydrate is cheap, stable, and proven. Generic brands work identically to premium ones. Look for Creapure-certified monohydrate if you want third-party tested purity — otherwise any reputable sports nutrition brand is fine.
Dosage
Maintenance dose: 3–5g per day. This is all you need. Take it consistently.
Loading phase (optional): 20g/day split into 4 doses for 5–7 days. This saturates muscle stores faster — you get the full benefit in a week instead of 3–4 weeks. It’s not required; it just speeds up the onset. Side effect: possible water retention and minor GI discomfort during loading.
Most people should skip loading and just take 5g daily. The difference is only in how quickly you saturate — the end state is identical.
Timing
Timing matters less than consistency.
Post-workout has a slight edge in some studies (improved uptake when muscles are insulin-sensitive post-exercise), but the effect is small. The most important variable is simply taking it every day.
Best practical approach: take it whenever fits your routine. Pre-workout, post-workout, with breakfast — pick the time you’ll actually remember and stick to it. Habit stacking it onto an existing routine (morning coffee, post-workout shake) is the most reliable way to make it a daily non-negotiable.
Who It Works For (and Who It Doesn’t)
Responds well: most people, especially those who are “low responders” to begin with (vegetarians and vegans have naturally lower muscle creatine stores from dietary absence, so they often see the largest initial response).
Responds less: “high responders” who already have naturally high creatine stores. Roughly 25–30% of people are non-responders — their muscles are already near saturation and supplementation produces minimal change. There’s no way to know in advance without a muscle biopsy; try it for 8 weeks and assess.
Safe for: healthy adults, including teenagers and older adults. Over 20 years of safety data with no demonstrated harm at standard doses.
Avoid if: you have kidney disease or impaired renal function. Creatine doesn’t cause kidney damage in healthy people, but it does increase creatinine (a kidney marker), which can complicate lab interpretation for those with existing conditions.
What to Expect
Week 1–2: body weight may increase 1–2kg from water retention (creatine draws water into muscle cells — this is normal and the water goes to the right place).
Week 3–4: strength gains begin to manifest. Extra reps, slightly higher top-end weights.
Month 2+: cumulative volume advantage compounds into visible hypertrophy differences compared to baseline.
You won’t feel anything acutely. Creatine isn’t a stimulant. The benefits are chronic, not immediate — which is why consistent daily dosing matters more than pre-workout timing.
The Bottom Line
The evidence supports a daily maintenance dose of 3–5g of creatine monohydrate, with timing being a secondary consideration. Assess results after 8 weeks of consistent use. Outside of creatine and adequate protein intake, most other supplements have limited or inconsistent evidence supporting their use for strength and hypertrophy outcomes.
Sources
- Rawson, E.S. & Volek, J.S. (2003) — Effects of creatine supplementation and resistance training on muscle strength and weightlifting performance. Journal of Strength and Conditioning Research, 17(4), 822–831.
- Lanhers et al. (2017) — Creatine supplementation and upper limb strength performance: A systematic review and meta-analysis. Sports Medicine, 47(1), 163–173.
- Candow et al. (2021) — Creatine supplementation for older adults: Focus on sarcopenia, osteoporosis, frailty and Parkinson's disease. Nutrients, 13(8), 2521.
- Antonio, J. & Ciccone, V. (2013) — The effects of pre versus post workout supplementation of creatine monohydrate on body composition and strength. Journal of the International Society of Sports Nutrition, 10, 36.