contraindications to b12 injections Vitamin B-12 Injection - Mobile and Clinic IV Therapy — ASAP IVs B12 Shots at Home: How,

However, vitamin B12 shots should be taken only by healthcare professionals

If you take vitamin B12 supplements, let your doctor know so they can tell you how much you need, and make sure they won't affect any medicines you're taking

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If levels of both B12 and B9 (folic acid, or folate) are "extremely high," the risk increases by more than 17-fold