Creatine: the most studied supplement in the world (complete guide)

The most researched supplement in history

Creatine monohydrate is, without exaggeration, the most studied sports supplement in scientific literature. The International Society of Sports Nutrition published an updated position paper in 2017 (Kreider et al., Journal of the International Society of Sports Nutrition) noting that over 1,000 studies have been conducted since the early 1990s, and concluded that creatine monohydrate is the most effective ergogenic nutritional supplement currently available for increasing high-intensity exercise capacity and lean body mass. A meta-analysis by Branch (2003), covering 96 peer-reviewed papers, found a small but significant effect on body composition (effect size 0.17) when creatine was combined with resistance training.

Creatine dosing protocols

There are essentially three dosing protocols backed by science (and one that is not). The standard daily dose is what most users should pick. Loading exists for fast saturation, body-weight scaling for heavier athletes, and cycling is a leftover bro-science myth:

What creatine actually does in your body

Creatine is a molecule naturally produced by your liver and kidneys from three amino acids: arginine, glycine, and methionine. About 95% of your body creatine is stored in muscle, about two thirds of it as phosphocreatine (Kreider et al., 2017), where it acts as a rapid energy reserve. During short, intense efforts (lifting heavy, sprinting, jumping), your muscles use ATP, but ATP runs out almost at once. Phosphocreatine donates a phosphate group to regenerate ATP, which lets you keep up a maximal effort a little longer. Over months, those extra reps translate into more muscle and strength.

• Strength: larger gains than training alone in multi-joint lifts (squat, bench press, deadlift)
• Lean mass: on average about 1.1 kg more than a placebo when combined with resistance training (Delpino et al., 2022)
• Repeated sprints and sets: performance in intense, repeated efforts usually improves by 10-20% once stores are full, depending on how much phosphocreatine rises (Kreider et al., 2017)
• Cognitive function: in 45 vegetarians it improved working memory and an intelligence test versus placebo (Rae et al. 2003, Proceedings of the Royal Society)
• Bone health: emerging evidence shows benefits in postmenopausal women combined with resistance training

How to take it: the simplest protocol

Forget the complicated loading and cycling protocols you read on bro-science forums. The science is clear and boring: take 3-5 grams of creatine monohydrate every single day, with any meal, with or without water. That is it.

• Type: creatine monohydrate (Creapure brand if available — German pharmaceutical grade). All other forms (HCl, ethyl ester, kre-alkalyn) are more expensive without proven benefits
• Dose: 3-5 grams daily. Larger athletes may need 5-10 g to keep their stores full (Kreider et al., 2017)
• Timing: does NOT matter. A 2013 study by Antonio and Ciccone in JISSN compared pre vs post training and found no difference
• Loading phase: optional. Loading with about 20 g/day for 5-7 days fills the stores faster; at 3 g/day you get there gradually in about 28 days (Kreider et al., 2017)
• Cycling: NOT necessary. Your body does not "downregulate" natural creatine production permanently

Myths debunked by 30+ years of research

• MYTH: damages kidneys — FALSE. Multiple long-term studies (Poortmans and Francaux, up to 5 years) show no effect on kidney function in healthy individuals. The slight rise in creatinine on blood tests is from creatine itself, not kidney damage
• MYTH: causes dehydration and cramps — FALSE. A 2003 study by Greenwood in 72 college football players, 38 of them creatine users, actually found FEWER cramps and dehydration episodes among those taking it
• MYTH: it is a steroid — FALSE. Creatine is a natural compound found in meat and fish (a pound of raw beef or salmon has about 1-2 g; Kreider et al., 2017). It has no hormonal action whatsoever
• MYTH: you need to cycle it — FALSE. You can take it indefinitely. Studies up to 5 years show no negative effects
• MYTH: makes you bloated — PARTIALLY FALSE. Initial water retention is intracellular (inside the muscle), making muscles look fuller, not puffier

Who should take it (and who should not)

Creatine benefits virtually everyone who does resistance training, anaerobic sports, or wants to preserve muscle mass with age. Vegetarians and vegans see the largest gains because their baseline muscle creatine is lower (no meat in the diet). The only group that should consult a doctor first are people with pre-existing kidney disease.

Creatine sits on top of the basics, it does not replace them: without enough protein and consistent training there is nothing for it to amplify. Photograph your meals with Renzy and you will see your protein for the day against your target, so the supplement is added to a diet that already covers the essentials.