Creatine: The Complete Guide

Creatine is a naturally occurring compound stored primarily in muscle and brain tissue. Your body synthesizes roughly 1g/day from amino acids (arginine, glycine, methionine) and obtains another ~1g from meat and fish. Supplementing raises intracellular phosphocreatine stores, which rapidly regenerate ATP during high-intensity effort, muscular or cognitive.

Unlike most biohacking supplements, creatine monohydrate has 30+ years of placebo-controlled research. It's legal, cheap ($0.10–0.30/day), and one of the most studied compounds in sports nutrition. The biohacking angle: it's not just for bodybuilders, brain creatine stores also matter for mental fatigue and sleep deprivation.

Muscle: Meta-analyses consistently show creatine increases lean mass, strength, and power output, especially when combined with resistance training. Effects are modest without training but still measurable in older adults for sarcopenia prevention.

Brain: Creatine supplementation may improve working memory and reduce mental fatigue, particularly under sleep deprivation or stress. Phosphocreatine buffers ATP in neurons the same way it does in muscle. Studies in vegetarians (who have lower baseline creatine) show clearer cognitive benefits.

Aging: Emerging research suggests creatine supports muscle preservation in adults over 50, potentially reducing fall risk and maintaining functional independence. Combined with resistance training, it's one of the highest-ROI longevity interventions under $20/month.

Maintenance dosing is simple: 3–5g creatine monohydrate daily, any time of day, with or without food. Consistency matters more than timing. Mix in water, coffee, or a shake, heat doesn't destroy creatine.

Loading (optional): 20g/day split into 4×5g doses for 5–7 days saturates stores faster. Skip loading if you experience bloating or GI discomfort, you'll reach saturation in ~3–4 weeks at 5g/day anyway.

Buy creapure-certified or third-party tested monohydrate. Avoid proprietary blends, liquid creatine, and 'buffered' forms, they cost more with no proven advantage over plain monohydrate.

Week 1 (with loading): +1–2kg water weight from intracellular hydration, this is normal, not fat. Strength may feel slightly improved in high-rep sets.

Week 2–4 (maintenance only): Gradual saturation. Training performance improvements become consistent. Some notice better recovery between sessions.

Month 2+: Full saturation. Cognitive benefits (if any) are subtle, less afternoon brain fog, better focus under sleep debt. Non-responders (~20–30% of people) have naturally high creatine from diet/genetics.

Creatine is among the safest supplements studied. Decades of research show no adverse effects on kidney function in healthy adults. Those with pre-existing kidney disease should consult a physician before supplementing.

Common side effects: bloating or cramping during loading phase (reduce dose or skip loading). Ensure adequate hydration, creatine pulls water into muscle cells.

Not recommended during pregnancy (insufficient safety data). Teenagers can use creatine safely per ISSN position stand, but prioritize whole-food nutrition first.

r/Supplements and r/Fitness treat creatine monohydrate as the default recommendation, 'just take 5g/day' is the meme-level consensus. Huberman recommends it for both physical and cognitive performance. Rhonda Patrick discusses creatine for brain health in aging.

Universal advice: buy the cheapest tested monohydrate, take it daily, don't overcomplicate. If you're vegetarian, vegan, or over 50, you're likely a high-responder.