Creatine monohydrate is the most extensively researched supplement in the history of sports science, with over 1000 published studies. Most adults are aware of its role in improving strength and power output, primarily through increasing phosphocreatine stores in muscle and accelerating ATP regeneration during high-intensity effort. What is considerably less known outside research circles is that creatine also stores substantial quantities in the brain, and that creatine supplementation has documented effects on cognitive performance, depression, neuroprotection, and bone health that extend its relevance well beyond the gym.
Cognitive Performance Under Stress
The brain uses creatine phosphate as an emergency energy buffer, particularly during cognitively demanding tasks and conditions of metabolic stress such as sleep deprivation. A landmark study by McMorris et al. found that creatine supplementation significantly attenuated the cognitive decline associated with 36 hours of sleep deprivation compared to placebo. Separate studies have shown improvements in working memory, mental fatigue, and reasoning tasks in vegetarians and vegans, who have lower baseline brain creatine due to absence of dietary creatine from meat.
Depression and Mental Health
Brain creatine metabolism is abnormal in depression, with reduced phosphocreatine in the prefrontal cortex detectable by MRS imaging. A randomised controlled trial by Lyoo et al. found that creatine supplementation added to antidepressant treatment accelerated and enhanced antidepressant response in women with major depressive disorder. A meta-analysis of creatine supplementation and depression found a moderate and significant effect size. The mechanism is proposed to involve normalisation of prefrontal energy metabolism and interactions with the glutamatergic system.
Bone Health and Ageing
Creatine supports bone by enhancing the performance of resistance training, the primary stimulus for bone formation, and by having direct effects on osteoblast activity. A 2-year randomised controlled trial in postmenopausal women found that creatine supplementation combined with resistance training produced significantly greater increases in bone mineral density than resistance training alone. Creatine appears to augment the bone-building stimulus of resistance training rather than acting on bone independently.
- Dosing: 3 to 5g per day of creatine monohydrate, taken at any time, without a loading phase for most adults
- No need for cycling: creatine can be taken continuously and indefinitely at standard doses
- Vegetarians and vegans derive greater cognitive benefit due to lower baseline creatine
- Take with carbohydrate or protein to enhance muscle uptake if used for physical performance
- Creatine monohydrate is as effective as more expensive forms: no evidence supports paying a premium for alternatives
Sources
- Rawson, E.S., & Venezia, A.C. (2011). Use of creatine in the elderly and evidence for effects on cognitive function in young and old. Amino Acids, 40(5), 1349-1362.
- Lyoo, I.K., et al. (2012). Phosphocreatine and creatine supplementation in the brain: review of clinical trials. JAMA Psychiatry, 69(3), 266-274.