Efficacy of oral compared with intramuscular vitamin B 12 supplementation after Roux en Y gastric bypass: a randomized controlled trial ScienceDirect Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project The Advantages of B12 Injections Versus Oral Supplements: Shawn Veiseh, M.D.: Family Medicine B12 injections often make a huge difference even though B12 taken orally is absorbed.
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