vitamin b12 cocktail injection Injections Hydroxocobalamin Injection: Vitamin B12 for

For some reason, and I can find no scientific basis for this, that recommendation was changed in 1974 to an injection every two months and then in 1984 to every three months

Raises NAD+ and SAM The same study showed that NAD+ and S-adenosyl-methionine (SAM) both went up after NNMT inhibition

Insufficient stomach acid Stomach acid, aka hydrochloric acid, plays an important role in releasing vitamin B12 from the proteins in food, which is later on absorbed through the intestine

2009 May;219(2):449-58

Dietary insufficiency is another significant cause, particularly among strict vegans and vegetarians, as vitamin B12 is naturally found almost exclusively in animal products including meat, fish, eggs, and dairy