The answer depends on the underlying cause of deficiency and individual absorption capacity
Theyre also helpful for people who dont get enough B12 from their diet (spoiler: often vegetarians and vegans) and for people whose guts cant break down and absorb the vitamin
Because it modulates a methylation and NAD+ pathway, interactions with other metabolically active compounds cannot be ruled out and have not been characterised in humans
Chances are, if youre standing in front of an impenetrable wall of pour-in products at your local auto parts store, youd rather be doing something else, like getting a root canal
Cox HD, Lopes F, Woldemariam GA, Becker JO, Parkin MC, Thomas A, Butch AW, Cowan DA, Thevis M, Bowers LD, Hoofnagle AN