can bac water go bad and Make You Sick Bac Water: A Clear Guide
Description
A supplemental nutritive source of vitamin B12 for cattle, horses, sheep, swine, dogs, and cats. The suggested dosage for cattle, horses, sheep, and swine is 1 to 2 ml; for dogs and cats is 0.25 to 0.50 ml. Administer IM or SQ. Suggested dosage may be repeated at 1 to 2-week intervals, as indicated by condition and response

Minerva Gastroenterol
It is not advisable to simply take vitamin B12 as a precautionary measure

Who needs it

So I added it into my diet with foods fortified with B12 and the occasional oral supplement before I started with B12 injections
