The Advantages of B12 Injections Versus Oral Supplements: Shawn Veiseh, M.D.: Family Medicine B12 injections have been high on my list, and I finally took the plunge today! Better absorption is just one of the perks, as it bypasses the stomach. Bloodwork is typically not Vitamin B12 Tablets vs Injection Which is Better? YouTube Low vitamin B12 can affect how you feel. Professional B12 injections, delivered with care and proper assessment. #FeelGoodLiving #PharmacistPrescriber When is vitamin B12 (cobalamin) given by injection rather than oral tablets?