can a b12 injection give you a headache Why Do I Feel Worse After My Injection? Understanding Post-Injecti – Oxford Origins Common & Rare Side Effects

Your body requires vitamin B12 for important functions, like metabolism, production of blood cells, and brain health

Deficiency can also be caused by poor absorption

Subcutaneous B12 administration, although promising in select cases such as congenital cobalamin disorders, lacks comprehensive comparative studies against IM and oral routes

Obese children and adolescents: a risk group for low vitamin B12 concentration In conclusion, our study has replicated the previous Indian findings of associations between lower serum B12 and higher obesity and insulin resistance during pregnancy in a non-diabetic White British population