what size needle is needed for b12 injection Shots at Home: How, Where & How Often to Inject Yourself gauge needle for b12 injection
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Read more: Headaches & Hydration: IV Therapy for Migraines & Fatigue What Causes High Vitamin B12 Levels
Some supplement proponents argue for combining methylcobalamin and adenosylcobalamin to cover both major B12-dependent pathways

Devalia V, Hamilton MS, Molloy AM (2014) Guidelines for the diagnosis and treatment of cobalamin and folate disorders

In other words, we cant blame you for wanting the shots to take effect ASAP