Creatine's reputation has mostly been built in gyms, as a scoop-in-your-shaker supplement for lifters chasing an extra rep. A new 12-week study out of Texas A&M University suggests it may do something for middle-aged adults even if they never set foot in a weight room.
Sixty-four healthy adults ages 45 to 65 completed the trial, choosing either to join a structured exercise-and-diet program or to stay out of one entirely. Within each group, participants were randomly assigned 10 grams of creatine monohydrate a day or a placebo. Adults who took creatine but didn't exercise still gained roughly 2.4 pounds of lean tissue over 12 weeks and improved their leg-press and bench-press strength, with no structured workout required. Those who combined creatine with three weekly sessions of resistance and aerobic training did better still, adding nearly 3 pounds of lean tissue while also losing body fat, something the placebo-plus-exercise group barely managed.
The study, published in the Journal of the International Society of Sports Nutrition, was led by Richard Kreider, who directs Texas A&M's Exercise and Sport Nutrition Lab and has studied creatine for more than three decades. Kreider's team frames the results as evidence creatine can help solve a problem specific to middle age: preserving muscle as the body's natural decline accelerates, even for people who aren't consistently active.
Creatine occurs naturally in the body and helps regenerate cellular energy; the body also makes some on its own and gets more from meat and fish, though not usually at supplement-level doses. Kreider noted just how much food that would take to match the study's 10-gram daily dose, making supplementation, in his words, "a more practical and less expensive option" than trying to eat your way there, since matching it through diet alone would mean eating "about five to 10 pounds of meat or fish each day."
Creatine's safety profile is well studied at this point: a 2025 analysis of 685 clinical trials found no significant difference in side effects between creatine and placebo groups. What's newer is the suggestion that its benefits extend past athletic performance and into ordinary healthy aging, giving a supplement long associated with locker rooms a second life as a middle-age staple.