Creatine Monohydrate
Backed by hundreds of RCTs and a strong International Society of Sports Nutrition position stand. Benefits for strength/power are well replicated; benefits for cognition are promising but more preliminary.
1. Overview
What it is
A naturally occurring compound stored mostly in skeletal muscle, synthesized from amino acids (glycine, arginine, methionine) and also obtained from meat and fish.
How it works
Increases phosphocreatine stores in muscle, which regenerates ATP rapidly during short, high-intensity efforts, and draws water into muscle cells supporting cell volumization signaling for growth.
Who should take it
Resistance trainers, athletes in short high-intensity sports, older adults doing resistance training (for muscle and possibly cognitive support), and vegetarians/vegans (who have lower baseline muscle creatine stores).
Who should avoid it
People with pre-existing significant kidney disease should consult a physician before use.
Evidence summary
One of the most well-researched supplements in sports nutrition; systematic reviews consistently show 5–15% improvements in strength and power output combined with resistance training, with an excellent long-term safety record in healthy individuals.
Scientific mechanism
Increases the phosphocreatine energy reserve, accelerating ATP resynthesis during high-intensity, short-duration exercise, and promotes cell swelling and satellite cell activation that support muscle protein synthesis.
2. Scientific Evidence Rating
Very Strong Evidence — based on high-quality human evidence including systematic reviews, meta-analyses, randomized controlled trials, and major clinical guidance where available.
Ratings reflect the overall quality and consistency of human evidence, not marketing claims. Where evidence is mixed, this is stated explicitly rather than rounded up.
3. Safety Rating
4. Is It Worth Taking?
Backed by hundreds of RCTs and a strong International Society of Sports Nutrition position stand. Benefits for strength/power are well replicated; benefits for cognition are promising but more preliminary.
5. Benefits
Each benefit is tagged with its own evidence strength — not every claim about a supplement is equally well supported.
- ★★★★★ Increases maximal strength and power output when combined with resistance training
- ★★★★★ Increases lean muscle mass gains during resistance training programs
- ★★★★☆ May support high-intensity, repeated-sprint performance
- ★★☆☆☆ Preliminary evidence for cognitive benefits, especially under sleep deprivation
6. Risks
Side effects
Water retention/weight gain (mostly intracellular, not bloating), occasional GI upset at high single doses.
Drug interactions
Theoretical caution with nephrotoxic medications; no significant interactions established in healthy individuals.
Who should avoid it / use caution
7. Recommended Dosage
8. Best Time To Take
- Any time of day — timing relative to exercise appears far less important than daily consistency
- With a meal may modestly aid uptake via insulin response
9. Food Sources
- Red meat
- Pork
- Fish (herring, salmon)
- Poultry (smaller amounts)
10. Deficiency Symptoms
Supplementation is most clearly evidence-based when it corrects an actual shortfall like the ones below — not as a routine addition for people who are already sufficient.
- Not an essential nutrient with a classical deficiency syndrome; vegetarians/vegans have lower baseline muscle creatine stores rather than a 'deficiency'
FAQ
Does creatine cause kidney damage in healthy people?
No — long-term studies in healthy individuals show no adverse effect on kidney function. Caution is reserved for people with pre-existing kidney disease.
Do I need to cycle creatine or do a loading phase?
Neither is required. A loading phase (20g/day for 5-7 days) only saturates muscle stores faster; a steady 3-5g/day reaches the same saturation within about 3-4 weeks.
11. Scientific References
Ratings and content on this page are based on the consensus of the following types of high-quality sources. This is educational information, not individual medical advice.
Key Research Papers
- ISSN Position Stand: safety and efficacy of creatine supplementation (PMC)
- Meta-analysis: creatine + resistance training in older adults (PMC)
General Reference Organizations
- International Society of Sports Nutrition — Position Stands
- PubMed — U.S. National Library of Medicine
- Cochrane Library — Systematic Reviews
⚕️ This page does not diagnose, treat, cure, or prevent any disease. Creatine Monohydrate is not a substitute for a varied diet or professional medical care. Always consult a qualified healthcare provider before starting any new supplement, especially if pregnant, breastfeeding, managing a health condition, or taking medication.