on Vitamin B12...
Vitamin B12 is an especially important vitamin for maintaining
healthy nerve cells and it aids in the production of DNA and
RNA, the body's genetic material. Vitamin B12 also works closely
together with vitamin B9 (folate) to regulate the formation
of red blood cells and to help iron function better in the
body. The synthesis of S-adenosylmethionine (SAMe), a compound
involved in immune function and mood, depends on the participation
of folic acid and vitamin B12.