Are There Any Side Effects from B12 Injections? Harley Laser Specialists London Dr. prescribed B12 injections. Pharmacy only gave me vials. Where do you get your needles and syringes? What size?? Where do I inject? : r B12_Deficiency Vitamin B 12 intramuscular injections are also used therapeutically to help restore energy and combat various symptoms related to such deficiencies. Vitamin B 12 is essential to the development of healthy blood cells, nerve Best Needle For B12 Injections (Size & Gauge) PA Relief B12 INJECTIONS WESTON HCG CENTER