can a b12 injection make you feel sick Best Shots in Chicago & Naperville 2026 Feeling worse after B12 Injection:

Individuals who suffer serious vaccine injuries may be eligible for compensation through the National Vaccine Injury Compensation Program (VICP)

---------- For use as a supplemental nutritive source of vitamin B12 in cattle, horses, swine, sheep, dogs and cats

Cyanocobalamin (Vitamin B12)

If you dont have a program nearby, the FDA page on drug take-back options describes a home method: mix the tablets with something unappealing (used coffee grounds, cat litter), seal the mix in a bag or container, and throw it in the household trash

So, by one route or another, animals must get vitamin B 12 from bacteria (and archaea)