Creatine slightly increased lean mass even without training

There were 64 healthy adults aged 45–65. Some chose a program themselves: strength and aerobic exercise three times a week, plus a moderate calorie deficit. Others didn’t exercise. Within each group, participants were randomly given either 10 g of creatine or a placebo. Self-selection matters: those who went to the gym may have been more motivated to begin with.

Even without training, creatine shifted body composition. Lean mass—the muscles and everything else the scales don’t count as fat—increased by about 2.4 pounds, or roughly 1.1 kg. Leg-press and bench-press strength improved slightly. This isn’t “muscle from a powder.” It’s a small increase in people who weren’t already short on protein or water: creatine draws water into muscle, and some of that extra weight may be water.

The results were more pronounced with gym training and reduced calories. Those taking creatine gained almost 3 pounds of lean mass, about 1.4 kg, and their body-fat percentage fell more than it did with the placebo. Time to exhaustion in a test also increased. Creatine didn’t add to aerobic capacity beyond what training itself achieved. It’s for short bursts of effort, not long distances.

Ten grams is more than the usual 3–5 g maintenance dose. The study didn’t examine side effects as a main focus. For a middle-aged person, the takeaway is narrow. A month of powder without gym training may slightly increase lean mass and everyday strength. Gym training with a calorie deficit makes the effect more noticeable and also reduces fat. A tub of supplements can’t replace movement.

The practical takeaway is narrower still. Twelve weeks and 64 people don’t make this a guide for everyone over 45. People who already have kidney problems or take medication can’t draw conclusions from this regimen. The increase without gym training is small and may partly disappear when the powder runs out and water leaves the muscle. The point isn’t that training has been made unnecessary. It’s that creatine stores in the muscles of middle-aged people may often be less than full—and a supplement can top them up faster than food can.

Sources:

1. Texas A&M University. "Creatine may help build muscle even without exercise, researchers find." ScienceDaily (September 29, 2026).
2. Chun J. et al. "Effects of creatine supplementation with and without exercise and diet intervention on body composition, cognitive function, and markers of health in middle-aged and older adults." Journal of the International Society of Sports Nutrition (2026). DOI: 10.1080/15502783.2026.2716273.