Creatine Was a Gym Supplement. The Older-Adult Trials Make a Quieter Case

For most of its history creatine has lived on the shelves of sports nutrition stores, sold in tubs with names that suggest explosions. That branding has made a lot of people over 50 assume it is not meant for them. The research on older adults suggests otherwise, though with a narrower and less exciting message than the labels promise.

What creatine does

Creatine is a compound the body makes from amino acids and also gets from meat and fish. Muscles store it as phosphocreatine, a quick reserve of energy for short, intense efforts like lifting a heavy box or climbing stairs fast. Supplementing raises those stores, which lets muscles do slightly more work in each set of exercise. Over weeks, more work can mean more muscle.

That last step is the important one. Creatine does not build muscle by itself. It helps the muscle respond to training.

What the trials in older adults show

Researchers have tested this idea in older adults for more than two decades, and several groups have pooled the results.

A 2014 meta-analysis² in Medicine and Science in Sports and Exercise combined trials with 357 older adults, average age about 64, who did resistance training for around 12 weeks. Those who took creatine gained more lean mass and strength and did better on functional tests than those who trained with a placebo. The authors called the results encouraging but noted the number of studies was limited.

A larger 2017 meta-analysis¹ pulled together 22 randomized trials with 721 participants whose average ages ranged from 57 to 70. Programs lasted 7 to 52 weeks with training two or three days a week. Adding creatine produced about 1.37 kilograms, or roughly 3 pounds, more lean tissue than training alone, along with greater gains in both upper and lower body strength.

A 2025 review⁴ in the European Review of Aging and Physical Activity reached a similar conclusion and found the clearest benefit in programs lasting up to about 32 weeks.

Three pounds may not sound like much. For context, adults tend to lose muscle steadily from midlife onward, and the loss speeds up after 60. As we reported in our story on muscle and aging, strength in later life tracks closely with independence. An added edge on top of a training program is meaningful, provided the training happens.

What it does not do

Trials of creatine without exercise have mostly been disappointing for muscle. Pills or powder alone are not a substitute for lifting.

Claims about brain health are where marketing has run furthest ahead of evidence. Some small studies suggest benefits for memory or mental fatigue in older or sleep-deprived people, while others find nothing. Research on bone density and falls is similarly early. None of it is strong enough to justify taking creatine for those reasons alone.

Safety and the kidney question

The International Society of Sports Nutrition³, in its 2017 position stand, concluded that creatine monohydrate is safe at recommended doses in healthy people across a wide age range, with no clinically significant side effects in the published research. That conclusion is widely shared, though the society is a sports nutrition group with an interest in supplements, which readers should keep in mind.

The most common worry is the kidneys, and it rests largely on a lab quirk. Creatine breaks down into creatinine, the same molecule a standard blood test uses to estimate kidney function. Taking creatine raises creatinine a little, which can make kidney function appear slightly worse on paper without any actual damage. Tell your clinician you take it before blood work, especially if you are being monitored for kidney function.

People who already have kidney disease, or who take medications that affect the kidneys, should not start creatine without talking to their doctor. Some people notice a pound or two of weight gain in the first weeks from water stored in muscle. Stomach upset is uncommon at standard doses.

If you want to try it

The trials in older adults used 3 to 5 grams a day of creatine monohydrate, or about 0.1 gram per kilogram of body weight. A loading phase of 20 grams a day is not necessary. A steady daily dose reaches the same muscle levels in about a month.

Monohydrate is the form with nearly all the research behind it, and it is inexpensive. Supplements are not reviewed by the FDA for quality before sale, so look for products tested by an independent group such as NSF or USP.

Then put it where it belongs, as an assistant to a strength program done two or three times a week, not a replacement for one.