Methylcobalamin B12 is involved in the production of acetylcholine, a neurotransmitter essential for memory, learning

https://squareblogs.net/cwearsajde/the-importance-of-methylcobalamin-b12-for-vegetarians-and-vegans

Methylcobalamin B12 is involved in the production of acetylcholine, a neurotransmitter essential for memory, learning, and muscle function