Task: Answer Verification
Input (English): Question: Does dietary guanidinoacetic acid increase brain creatine levels in healthy men?
Answer: Supplemental GAA led to a region-dependent increase of the creatine pool in the human brain. This might be relevant for restoring cellular bioenergetics in disorders characterized by low brain creatine and functional enzymatic machinery for creatine synthesis, including neurodegenerative diseases, brain tumors, or cerebrovascular disease.
Output (English): yes