Should I take creatine?
Yes, if you resistance train and you tolerate it. I would use creatine monohydrate as muscle-and-performance support, not as a proven longevity drug. The strongest evidence is that it helps high-intensity exercise performance and may add strength benefit when paired with training; the lifespan claim is still an inference.
Dose
Plain creatine monohydrate, usually 3–5 g daily; loading is optional.
Best use
Training support for strength, power, and muscle—not a proven lifespan drug.
Watch
GI tolerance, water-weight change, kidney context, and whether training actually improves.
What creatine is actually good for
Creatine helps regenerate ATP during short, high-intensity efforts. That is why the evidence is strongest for strength, power, sprint-like work, and training volume. Those outcomes matter for healthspan because muscle, power, and the ability to train are upstream of independence.
The honest claim is narrower than the internet claim: creatine can help you train better. Training better can help preserve muscle and function. Preserving muscle and function is relevant to aging. That is not the same as proving that creatine extends lifespan.
Evidence grade for strength/performance support: strong.
Evidence grade for direct longevity extension: speculative.
Best formcreatine monohydrate; most blends are just more expensive theater.
Safety and kidney nuance
Creatine can raise serum creatinine because creatinine is a breakdown product of creatine. That does not automatically mean kidney damage. The more important question is whether filtration is changing. In a healthy adult using standard dosing, the safety data are reassuring, but I am more cautious in established kidney disease or when other kidney-risk medications are involved.
What I would not do
I would not pay for exotic creatine forms, cycle on and off without a reason, or use creatine as a substitute for lifting. I also would not let a small creatinine bump trigger panic without checking context, hydration, dose, muscle mass, and, when needed, another kidney marker.
When to talk to your doctor
Talk first if you have chronic kidney disease, a kidney transplant, recurrent kidney stones, pregnancy, unexplained abnormal kidney labs, or you take medications where kidney function is already being watched closely.
Clinical lens
How I’d decide
Use this section as a second pass after the main answer, not as homework before you know what the page is saying.
Who it’s for
People doing progressive strength training, older adults trying to preserve muscle and power, vegetarians or vegans with lower dietary creatine intake, and women in midlife who want a low-drama supplement that may make training slightly more productive.
Who should skip it
People with significant kidney disease, unexplained kidney-function changes, pregnancy unless their clinician has specifically okayed it, or anyone expecting creatine to replace lifting, protein, sleep, or rehabilitation. Stop if it causes persistent GI symptoms or unwanted water-weight changes.
Measure before / after
Track training performance, reps or load on major lifts, sprint or power work if relevant, weight or waist change, GI tolerance, and lean mass if you already have a reliable measurement. Check creatinine/eGFR before and after if kidney disease, nephrotoxic medications, or clinician concern are in the picture; consider cystatin C if creatinine becomes hard to interpret.
What I’d do first
Use plain creatine monohydrate, 3–5 g daily, taken whenever you will remember it. I would skip loading for most people. Pair it with 2–4 days per week of progressive resistance training and enough dietary protein. If there is no training plan, creatine drops from high-value to optional.
What would change my mind
I would upgrade the longevity claim if long-term randomized trials showed fewer falls, fractures, disability, cognitive decline, or cardiometabolic events. I would downgrade routine use if better data showed kidney harm in healthy adults at standard dosing or meaningful harms in the midlife/older populations most likely to use it.
Frequently Asked Questions
Does creatine make you gain weight?
Often a little, mostly from intracellular water and sometimes from better training. That is not the same as fat gain, but it can matter if scale weight is psychologically loaded or weight-class performance matters.
Do I need a loading phase?
Usually no. Loading works faster, but 3–5 g daily reaches the same practical place for most people with less GI drama.
References & citations
- 1.International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. JISSN, 2017
- 2.Sharifian et al. Creatine supplementation plus exercise training in older adults: systematic review and meta-analysis. European Review of Aging and Physical Activity, 2025
- 3.Kabiri Naeini et al. Effect of creatine supplementation on kidney function: systematic review and meta-analysis. BMC Nephrology, 2025
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