Creatine is an effective supplement for boosting strength and muscle mass. It is found naturally in meat, fish, and other animal products. It works, in part, by increasing the formation of a high-energy compound called creatine phosphate (CP). CP is vital for chemical reactions throughout the body, particularly in the brain and skeletal muscles. CP storage may be limited in vegetarians.
A British study from the University of Swansea found that creatine monohydrate supplements (20 grams for five days) improved memory in vegetarians and reaction time in vegetarians and non-vegetarians, but had no effect on measures of verbal communication. Creatine supplements may improve some types of mental ability in vegetarians. The question is: Are vegetarians who take creatine still vegetarians? (British Journal of Nutrition, published online)