Creatine monohydrate

Creatine helps muscles regenerate energy for short bursts of intense effort. The body makes some and meat and fish supply the rest. Creatine monohydrate is the form used in most research; newer forms cost more without demonstrated advantage.

Creatine monohydrate is a stable white powder that dissolves better in warm liquid. Micronised monohydrate dissolves more easily but is the same molecule. Creatine ethyl ester, buffered forms and liquid creatine have not been shown to outperform monohydrate, and liquid creatine degrades.

Creatine is stored in muscle as phosphocreatine, which rapidly rebuilds ATP during intense effort, allowing more work before fatigue.

Dozens of randomised trials and multiple systematic reviews show improved strength, power and repeated-sprint performance when creatine is combined with training, plus greater gains in lean mass. Benefits are for training adaptation rather than effortless change. Cognitive, mood and clinical neurological applications are being studied, with inconsistent results so far.

Animal and cell studies describe creatine transport, phosphocreatine shuttling in muscle and brain, and effects on cellular energetics under stress.

Evidence gap: Non-human evidence. It supports the mechanism and generates hypotheses for brain and clinical uses that human trials have not yet established.

Creatine is absorbed well and taken up into muscle with help from insulin, so carbohydrate or a mixed meal can modestly increase uptake. Caffeine and creatine can be taken together; older concerns about interference are weakly supported.

In healthy adults, creatine monohydrate has a strong safety record in trials up to several years, with weight gain from water retention, and occasional bloating, nausea or cramping most commonly reported. It has not been shown to damage healthy kidneys, but people with existing kidney disease, those taking nephrotoxic medicines, and pregnant or breastfeeding people should seek clinician advice because data are limited. It is not a substitute for adequate protein, sleep or a sensible training programme, and product purity still matters for drug-tested athletes.

Powders, capsules, tablets and gummies are all available; monohydrate is the researched standard. Trials have used both short loading phases and steady daily intake, with similar end results over several weeks.

Creatine supports a training programme rather than replacing one. Related approaches are adequate total protein and energy intake, progressive resistance training, sleep, and for older adults, supervised strength work and fall prevention. It is not a treatment for any medical condition.

Educational example: an adult starts creatine, gains two kilograms in a fortnight and a routine blood test shows slightly raised creatinine; the clinician recognises the supplement effect and repeats testing appropriately. Decision factors are expected water weight, correct interpretation of creatinine, and kidney history. Questions worth asking: is creatine appropriate with my medicines and kidney results, and should cystatin C be used instead? Anti-doping consideration: creatine is permitted, but only third-party tested products meaningfully reduce contamination risk for tested athletes.