While they are safe for almost everyone, some contraindications include those who are breastfeeding or pregnant, or who may have an allergy or sensitivity to any of the ingredients included in the shot
In addition, B12 deficiency can result in Megaloblastic Anemia, a type of anemia in which the red blood cells grow without dividing, becoming enlarged
Much of the research framing treats it as an orally administered compound, and in practitioner circles it circulates in oral/sublingual forms (capsules, or the reconstituted solution taken sublingually)
In many cases, its fine to continue a multivitamin while on B-Complex injections, but it may not be necessary
+ Can HPLC purity alone characterise a copper complex
Do not take another dose for the week