where to inject b12 in arm How self-inject intramuscular vitamin - Overview Best Vitamin B12 Injection Sites:

The company states prescriptions are filled by U.S.-based compounding pharmacies and notes FDA registration where applicable

The AAFPs evidence-based clinical review states directly: Oral administration of high-dose vitamin B12 (1 to 2 mg daily) is as effective as intramuscular administration for correcting anemia and neurologic symptoms in patients with B12 deficiency (Langan RC, Goodbred AJ, American Family Physician, 2017)

Other tests they may do include: Advertisement Since vitamin B12 absorption is blocked, your healthcare provider may prescribe intramuscular vitamin B12 injections

Serious reactions are uncommon but include hypersensitivity and anaphylaxis, more often reported with parenteral thiamine

Why Some People Cant Convert B12 Effectively Up to 4050% of the population carries genetic polymorphisms (MTHFR C677T, A1298C) that impair their ability to convert B12 effectively

If you're pregnant or breastfeeding, chat with your doctor first