How Much Creatine to Take by Body Weight

The ISSN Position Stand (Kreider et al., 2017) recommends a maintenance dose of 3–5 g/day sustained indefinitely. By body weight, this equals ~0.03 g/kg/day — for a 70 kg person that's ~2.1 g, rounded up to the practical minimum of 3 g/day. The optional loading dose is 0.3 g/kg/day for 5–7 days, split into 4 doses. Both protocols reach the same final level of muscle saturation.

Both strategies work. Loading (0.3 g/kg/day × 5–7 days) saturates phosphocreatine stores faster — useful if you have a competition soon. Maintenance-only (3–5 g/day) reaches the same saturation level in 3–4 weeks. Advantage of skipping loading: fewer GI complaints (loading can cause bloating or loose stools in sensitive people) and simpler scheduling. For most people starting out, going straight to 3 g/day is the most comfortable approach.

Yes. Long-term safety studies up to 5 years of continuous use in healthy individuals found no kidney, liver, or cardiovascular harm attributable to creatine monohydrate. The ISSN and NSCA consider chronic supplementation at standard doses safe. When to consult your doctor first: pre-existing kidney disease, elevated baseline creatinine, regular use of NSAIDs or certain diuretics, or any active kidney/liver condition. No 'cycling' or rest periods are needed — creatine doesn't cause tolerance.

Yes, but it's water, not fat. Expect to gain 1–2 kg in the first 2–4 weeks from intramuscular water retention (creatine osmotically draws water inside muscle cells, making them look and feel fuller). Over the medium term with strength training, you may add 1–2 additional kg of actual lean mass. The initial water weight is reversible — it's lost within 4–6 weeks of stopping. Creatine does not cause subcutaneous water retention (the kind that blurs muscle definition).

There is no solid evidence for this. The concern originated from a single small 2009 study in South African rugby players that showed a modest DHT increase — but that study didn't measure hair loss directly and was never replicated in subsequent research. Systematic reviews through 2024 conclude that creatine has no significant effect on DHT, androgenic alopecia, or acne.

Monohydrate, hands down. It is the most studied form (1,000+ trials), the cheapest, and has equivalent or superior efficacy compared to alternatives. Forms like creatine HCl, ethyl ester, and kre-alkalyn are marketing differentiations — they promise better absorption or no loading phase, but none has demonstrated clinical superiority in independent controlled studies. Choose micronized creatine monohydrate from a brand with Creapure certification or equivalent third-party testing.

Timing matters little. Creatine works through chronic saturation of muscle stores, not acute effects like caffeine. A study by Antonio & Ciccone (2013) compared pre- vs post-workout timing and found only minimal, non-clinically relevant differences slightly favoring post-workout. Practical advice: take it at whatever time of day is easiest to remember consistently. On rest days, take it anyway — maintaining saturated stores every day is the goal.

Emerging and promising evidence, especially in vegetarians/vegans (who have 30–40% lower baseline muscle and brain creatine) and older adults. A systematic review by Avgerinos et al. (2018) in Experimental Gerontology showed significant improvements in working memory and processing speed in adults over 65. The same standard 3–5 g/day sustained for at least 4–6 weeks appears sufficient. Cognitive benefits are less robust than physical benefits — don't expect dramatic effects, but they may offset age- or diet-related cognitive decline.

Absolute or relative contraindications: (1) Chronic or acute kidney disease — consult a nephrologist first. (2) Elevated baseline creatinine on bloodwork — investigate the cause before adding creatine. (3) Under 18 — evidence is limited; prioritize diet and pediatric sports medicine guidance. (4) Pregnancy and breastfeeding — insufficient evidence; consult your OB. (5) Chronic NSAID use (ibuprofen, diclofenac daily) or certain diuretics — check for interactions. For healthy adults without these conditions, no documented contraindications exist.

With loading (0.3 g/kg/day × 5–7 days): full muscle saturation in 5–7 days. Performance improvements (more reps, less fatigue) are noticeable within the first week. Without loading (3 g/day from day 1): 3–4 weeks for full saturation. For body composition changes (hypertrophy, lean mass), allow 4–8 weeks of consistent supplementation combined with progressive resistance training. Daily consistency is the most important factor — skipping days extends the time to saturation.