Study Finds Creatine May Boost Strength Without Exercise

A small Texas A&M trial reports creatine monohydrate raised lean mass, strength and endurance in adults 45–65 even without diet or exercise.

A new randomized clinical study from Texas A&M University, published in the Journal of the International Society of Sports Nutrition, tested creatine monohydrate in 64 adults aged 45 to 65. Participants were split into four groups: two received 10 grams of daily creatine monohydrate (five grams in the morning and five at night), while the other two received a placebo. Independently of the supplement, each person chose whether to join a supervised program of resistance and aerobic training three times a week, paired with a diet plan cutting 300 to 500 calories a day and recommending 55 percent of calories from carbs, 15 percent from protein and 30 percent from fat. Body measurements, blood tests and cognitive assessments were taken at the start, at six weeks and after 12 weeks.

Researchers found that people who took creatine but skipped the diet and exercise program still increased their lean tissue mass, strength and muscular endurance, suggesting benefits from the supplement alone. Women's Health notes this challenges the common clinical assumption that creatine primarily helps only when combined with exercise. "To my knowledge this is potentially new information as we previously believed creatine to primarily only help when combined with exercise," Shane Davis, MD, sports medicine physician and physiatrist at Tufts Medical Center, told Women's Health. Lifespan Research Institute adds that creatine approximately doubled the effectiveness of exercise on muscle strength in the trial, with the creatine-plus-exercise group seeing the largest gains.

According to Lifespan Research Institute's coverage, leg-press maximum increased by about 34 percent with exercise plus creatine versus 18 percent with exercise plus placebo, and bench-press maximum rose about 23 percent versus 12 percent. Creatine without exercise also improved bench-press strength relative to the non-exercising placebo group. Body-fat percentage declined about 3.24 percent with exercise/diet plus creatine, versus 1.87 percent with exercise/diet plus placebo, and both creatine groups gained lean tissue while placebo groups showed little change. On cognition, most analyses did not reach statistical significance, though a word recognition test favored creatine — Women's Health reports the creatine-only group showed better cognitive function and memory.

Experts offered several theories to Women's Health. Albert Matheny, RD, CSCS, co-founder of SoHo Strength Lab, described creatine as "hyper hydrating," explaining that it expands creatine phosphate stores — a natural energy system in muscles — and draws more water into muscle cells, which supports the use and creation of protein in the body. Study co-author Richard Kreider, PhD, of Texas A&M, suggested creatine can provide energy for the brain, saying "if you increase energy in the brain, you can think better." He also noted participants may simply have had more energy for daily activity plus better cellular hydration, contributing to muscle gain. Lifespan Research Institute cautions that increased lean mass on DXA scans may partly reflect water weight.

The findings are explicitly framed as exploratory, and Lifespan Research Institute flags that the study was small and had limitations, including non-randomized exercise participation and creatine's effect on body water clouding lean-mass estimates. Women's Health also discloses a potential conflict: study co-author Richard Kreider has previously conducted sponsored creatine research and sits on the board of the company that supplied the creatine, while other co-authors reported no conflicts. For middle-aged and older adults at risk of sarcopenic obesity, Lifespan notes the stakes are real — losing fat through caloric restriction risks also losing muscle, so a supplement that protects lean tissue could matter for mobility and metabolic health.

Dr. Davis still strongly recommends using creatine as an adjunct to regular exercise, not a replacement, since those who combined the two saw more substantial improvements and exercise carries many additional benefits. Kreider says the findings suggest "creatine is important throughout the lifespan," and that people seeking cognitive benefits may need up to 10 grams daily rather than the typical two to three grams. Women's Health advises checking with a healthcare provider before starting, because dosing can be tricky and side effects include GI discomfort and bloating. Lifespan notes that whether results translate to other contexts needs more research, leaving larger trials as the likely next step.