A 12-week study from Texas A&M University found that adults ages 45 to 65 who took creatine gained lean tissue and strength even without following a structured exercise program, and that combining creatine with exercise and a calorie-reduced diet produced even greater strength gains while adding muscle and reducing fat.
What the study found
The trial, published in the Journal of the International Society of Sports Nutrition, enrolled 64 healthy middle-aged adults who completed the full 12 weeks. Participants chose whether to join a structured exercise and diet-induced weight-loss program or to stay in a non-exercise group. Within each group they were randomly assigned to take either 10 grams of creatine monohydrate or a placebo daily.
Among participants who did not follow the exercise program, those taking creatine added roughly 2.4 pounds of lean tissue over 12 weeks and improved their leg press and bench press strength. The exercise group performed resistance and aerobic training three times a week. In that group, those who added creatine saw greater gains in leg press strength, bench press strength, and time to exhaustion than those on placebo. Creatine did not improve aerobic capacity beyond what exercise alone provided, a result that matches earlier evidence that creatine primarily supports muscular strength and power rather than aerobic fitness.
Can creatine help with fat loss while preserving muscle?
The researchers also looked at a common concern with weight loss: how to reduce body fat without sacrificing muscle. Participants in the exercise group followed a diet that created a modest calorie deficit. After 12 weeks, those who took creatine had added close to three pounds of lean tissue while also losing fat mass. By comparison, exercisers on the same diet who took a placebo showed little change in lean tissue. The creatine group also saw a larger drop in body fat percentage. According to the researchers, this is the first study to show that adding creatine to an exercise and diet-induced weight-loss program can reduce body fat percentage more than exercise and diet alone.
Why does this matter for healthy aging?
Preserving muscle becomes harder with age, and loss of muscle mass is tied to declines in strength, mobility, and metabolic health. The findings add to decades of work looking at creatine as more than a workout supplement, including its potential value for older adults facing age-related declines in muscle mass and cognitive function. Creatine occurs naturally in the body and is found in foods like meat and fish, but reaching the 10-gram daily amount used in the study from diet alone would require eating roughly five to 10 pounds of meat or fish per day, making supplements a more practical option for most people.
How safe is creatine?
Creatine is one of the most heavily studied sports and nutritional supplements. A 2025 review analyzed 685 clinical trials and found no significant difference in reported side-effect rates between people taking creatine and those receiving a placebo. The 12-week study was funded by the WoodNext Foundation through the Texas A&M Foundation.
FAQ
Can creatine help build muscle without exercise?
Yes, according to a 12-week Texas A&M study of adults ages 45 to 65. Participants who took 10 grams of creatine monohydrate daily without a structured workout program gained about 2.4 pounds of lean tissue and improved leg press and bench press strength.
How much muscle can you gain on creatine with exercise?
In the same study, middle-aged adults who combined creatine with resistance and aerobic training three times a week and a modest calorie-reduced diet added close to three pounds of lean tissue over 12 weeks while also losing fat mass, with larger strength gains than placebo.
Is creatine safe for older adults?
A 2025 review of 685 clinical trials found no significant difference in reported side-effect rates between people taking creatine and those taking a placebo, supporting its safety profile in the populations studied.
