Creatine occurs naturally in red meat, fish, and (to a small extent) poultry. The body also synthesizes some creatine endogenously. Supplementation raises muscle creatine stores beyond what diet alone typically provides, which translates to small but consistent performance benefits in high-intensity work.
What creatine does:
- Increases phosphocreatine availability in muscle, which supports ATP regeneration during short, intense efforts (sprints, sets of 1-12 reps).
- Modest strength and power gains of roughly 5-10% on average across populations, larger for novice trainees and smaller for elite athletes.
- Slight increase in cell volume (water held in muscle), which contributes to a small amount of weight gain (1-3 lb) in the first 1-3 weeks.
- Possible cognitive benefits in some studies, though the evidence is less robust than the strength benefits.
Dosing:
- Standard maintenance dose: 3-5 g per day, taken at any time. Timing relative to training is largely unimportant for the long-term effect.
- Loading phase (optional): 20 g per day split into 4 doses for 5-7 days, then 3-5 g per day. Saturates muscle stores faster but is not required; daily 3-5 g reaches the same level after about 4 weeks.
- Cycling: not necessary. Long-term daily use is supported by extensive safety research.
Form:
- Creatine monohydrate is the most-studied and cheapest form. Other forms (HCl, ethyl ester, etc.) do not show meaningfully better results in head-to-head studies.
- Mix with water, juice, or a shake. No specific carrier is required.
Who should not use creatine:
- Users with kidney disease should consult a clinician first (creatine is excreted via kidneys; healthy kidneys handle it without issue, but compromised kidneys can be affected).
- Users on specific medications (caffeine, NSAIDs at very high doses) where interactions have been mentioned in some literature, though the evidence is limited.
- Pregnant or breastfeeding users without clinician guidance.
The honest framing: creatine is one of very few sports supplements that consistently shows benefit in controlled studies. The effect is small but real. It is not a substitute for training, nutrition, or sleep, but it is a reasonable addition to the stack for users targeting strength or power outcomes.