Creatine, clearly.

Creatine is not a stimulant, hormone, or shortcut around training. It is a naturally occurring compound that helps replenish cellular energy during brief, repeated, high-intensity effort.

What creatine actually does

About 95% of the body’s creatine is stored in skeletal muscle, much of it as phosphocreatine. During demanding muscular work, that phosphocreatine helps regenerate ATP, the immediate energy currency used for contraction.^[1]

A mixed diet commonly leaves muscle creatine stores below full saturation. Supplementation can increase muscle creatine and phosphocreatine by roughly 20–40%, which is why the effect is most relevant to repeated sprints, heavy sets, jumps, and other high-output work rather than steady, low-intensity activity.^[1]

Who is most likely to notice a benefit?

• People who resistance train: creatine can support greater gains in strength and lean mass when paired with progressive training.
• Power and field-sport athletes: it can improve the capacity to repeat brief, intense efforts.
• Adults preserving strength with age: the most consistent results appear when creatine accompanies resistance training.
• People who eat little meat or fish: lower starting creatine stores may leave more room for a response, although individual results still vary.

Research on cognition is encouraging but less settled. A 2024 meta-analysis of 16 randomized trials found modest improvements in memory and some measures of attention and processing speed, but not overall cognition or executive function; certainty was moderate for memory and low for most other outcomes.^[2] That makes cognition a promising research area, not a guaranteed consumer outcome.

How to take it

Three to five grams daily gradually saturates muscle over roughly three to four weeks. If faster saturation matters, an optional loading phase of 20 grams per day, divided into four 5-gram servings for 5–7 days, can be followed by 3–5 grams daily.^[3]

Loading changes how quickly you reach saturation, not the ultimate destination. A daily 3-gram protocol for 28 days produced a similar increase in muscle creatine to 20 grams daily for six days.^[3]

Does timing matter?

Current research does not establish one clearly superior time of day. Creatine works by raising tissue stores, so taking it consistently matters more than whether the scoop lands before or after a workout.^[3] Mix it into water or another beverage and use the timing you can repeat.

Do you need to cycle off?

No. After supplementation stops, elevated muscle stores generally return toward baseline over four to six weeks, with no evidence that they fall below baseline or that the body’s own synthesis remains suppressed.^[1]

What to expect in the first month

A loading phase may raise scale weight by roughly 1–3 kilograms, largely from water associated with increased muscle creatine storage. That is not an increase in fat mass.^[3] Skipping the load and using 3–5 grams daily usually makes the early change more gradual.

Some people experience stomach discomfort or loose stool when taking a large amount at once. In a randomized study, a single 10-gram serving produced more diarrhea than the same daily amount divided into two 5-gram servings.^[4] If your stomach objects, reduce the serving size, split the dose, and take it with a meal.

Who should speak with a clinician first

The broad safety record applies most confidently to healthy people using studied doses. Speak with a qualified clinician before starting if you have known kidney disease, abnormal kidney testing, a complex medical condition, or take medications that may affect kidney function. Pregnancy and breastfeeding lack adequate human dosing and safety evidence, so they are not situations for self-directed use.^[5]

People under 18 should involve a pediatric clinician and a qualified sports professional. If you have upcoming laboratory work, tell the ordering clinician you use creatine because the supplement can modestly raise serum creatinine through normal creatine turnover without necessarily indicating impaired filtration.^[6]