Creatine is usually associated with gym workouts, strength training and athletic performance. But a new 12-week clinical trial has raised interest in another possible use: helping middle-aged and older adults maintain or increase lean tissue even when they are not following a structured exercise programme.
The study, published in the Journal of the International Society of Sports Nutrition, involved healthy adults between 45 and 65 years old. Researchers from Texas A&M University examined whether creatine supplementation could influence body composition, strength, endurance and selected health markers both with and without exercise.
What the study found
A total of 73 sedentary adults entered the study, while 64 participants completed the 12-week intervention and were included in the final analysis. Participants were divided between a group that continued without structured exercise and another that followed an exercise and diet programme. Within those groups, participants received either creatine monohydrate or a placebo.
The researchers reported that participants taking creatine without structured exercise experienced increases in lean tissue mass, strength and muscular endurance. The exercise-and-diet group taking creatine also showed improvements, including gains in lean tissue and strength, along with a greater reduction in body-fat percentage during the weight-loss intervention.
The supplementation protocol used in the trial provided 10 grams of creatine per day, divided into two 5-gram doses.
Why the finding is attracting attention
Muscle mass naturally tends to decline with age, and preserving lean tissue becomes increasingly important for maintaining physical function. Weight-loss programmes can also result in the loss of lean tissue along with body fat.
The researchers therefore examined whether creatine could help support lean tissue during these situations. Their findings suggest that the supplement may have benefits beyond its traditional use among athletes and people performing resistance training.
Does this mean you can build muscle without working out?
Not necessarily.
The study provides evidence of an increase in lean tissue mass, but lean tissue measurements can include more than contractile muscle. Creatine is also known to increase water stored within muscle, which can contribute to changes measured as lean mass.
More importantly, the study was relatively small and focused specifically on healthy adults aged 45–65. It should not be interpreted as evidence that creatine can replace exercise for building muscle.
A 2026 systematic review and meta-analysis involving younger men found that improvements in lean body mass were significant when creatine was combined with resistance training, while comparable body-composition benefits were not observed in non-resistance-training conditions.
Exercise still matters
Resistance training provides the mechanical stimulus that tells muscles to adapt and become stronger. Creatine can support the body's energy systems and may enhance training adaptations, but it is not a substitute for physical activity.
The latest trial itself found particularly strong outcomes when creatine was combined with exercise and a weight-loss diet.
What researchers say about the results
The authors concluded that creatine supplementation, both with and without exercise and dietary intervention, may help middle-aged and older adults maintain lean tissue and strength.
However, they also described several of the cognitive and metabolic findings as exploratory, meaning those observations require confirmation through additional research. The study's results therefore provide an interesting direction for future research rather than a final answer about creatine's effects in people who do not exercise.
The takeaway
The new research challenges the simple idea that creatine's potential benefits are limited to people who work out. In this particular 12-week trial, middle-aged and older adults taking creatine showed increases in lean tissue and strength even without structured exercise.
However, the study was relatively small, and the results should not be interpreted as proof that supplements can replace exercise. For muscle development and physical fitness, regular resistance training remains an important component of the evidence-based approach
