b12 injection hives Taiwanese doctor warns chronic vitamin deficiency can cause | Taiwan News Feeling worse after B12 Injection:

Another frequently asked question is, "Does B12 expire?" Like all medications and supplements, B12 injections have a limited shelf life: Expiration Dates: Always check the expiration date labelled on your B12 injection vial

Unlike fat-soluble vitamins, the body cannot store large reserves of B12

They may not be worth the cost, either

Symptoms include fatigue, weakness, pale skin, shortness of breath, constipation, and tingling in the hands and feet

Ideal Candidates for Lipo B Injections: Is It Safe for You

Rare adverse effects specific to cyanocobalamin may include mild transient diarrhea, particularly with initial doses, and very rarely, allergic reactions in sensitive individuals