Vitamin B 12 (Systemic)

Side Effects of This Dietary Supplement

Along with its needed effects, a dietary supplement may cause some unwanted effects. Cyanocobalamin or hydroxocobalamin does not usually cause any side effects.

However, check with your health care professional immediately if any of the following side effects occur:

Rare - soon after receiving injection only

Skin rash or itching; wheezing

Check with your health care professional as soon as possible if either of the following side effects continues or is bothersome:

Less common

Diarrhea; itching of skin

Other side effects not listed above may also occur in some individuals. If you notice any other effects, check with your health care professional.