Bottom line: For generally healthy adults, creatine monohydrate at 3–5 grams daily is a practical option. In older adults, the strongest case is for pairing it with progressive resistance training—not taking it instead of training.
What creatine actually does
Creatine helps replenish phosphocreatine, which supports rapid energy production during hard muscular efforts. That can improve training quality. Over time, better training can contribute to gains in strength and lean mass.
A 2023 meta-analysis found that adding creatine to resistance training produced a small additional increase in direct measures of skeletal muscle in older adults. Earlier meta-analyses also found improvements in lean tissue and upper- and lower-body strength when creatine accompanied resistance training.
How much should you take?
Simple approach: take 3–5 grams of creatine monohydrate once daily. Timing matters less than consistency. Taking it with a meal is convenient and may reduce stomach discomfort for some people.
A loading phase—often about 20 grams daily divided into smaller doses for five to seven days—fills muscle stores faster, but it is not required. A steady daily dose eventually reaches the same destination.
What changes should you expect?
A modest increase on the scale
Early weight gain is commonly water stored inside muscle, not body fat. That is part of creatine’s normal effect. Long-term body composition changes depend primarily on training and nutrition.
Better support for repeated hard efforts
Creatine is most relevant to lifting, sprinting, and repeated high-intensity work. Do not expect it to create an immediate stimulant-like sensation.
Cognition claims need restraint
Research on brain health and cognition is promising but less settled than the strength evidence, especially for healthy older adults. Treat cognitive benefit as possible—not guaranteed.
Kidneys, labs, and safety
Research in people without underlying kidney disease has generally not shown kidney damage at studied doses. Creatine can raise blood creatinine because creatinine is a breakdown product of creatine; that can complicate interpretation of an estimated kidney-function result without necessarily indicating injury.
What to buy
Choose plain creatine monohydrate. It is the form used in most research. A product with credible third-party testing is preferable to a proprietary blend with stimulants or unclear doses.
The Biohack Journey verdict
Evidence grade: strong for supporting resistance-training outcomes; moderate-to-uncertain for many broader longevity claims. Creatine earns a place only after the program itself is in place: sensible lifting, enough protein, adequate sleep, and consistent recovery.