PDF) Comparison of sublingual vs. intramuscular administration of vitamin B12 for the treatment of patients with vitamin B12 deficiency What is B12 Injection Used for? ThinWorks B12 Injections vs Pills Baltimore: Which Works? Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project Amazon.com: Organic Vitamin B12 1000 mcg Sublingual Liquid Drops For Adults, 6 Months Supply 1 oz, Methylcobalamin & Adenosylcobalamin Bioactive Blend for Energy, Clarity & Focus Vegan, Non GMO, Unflavored : Health & Household Efficacy of sublingual versus oral vitamin B12 supplementation for the treatment of vitamin B12 deficiencyA prospective randomised open label study Clinical Nutrition ESPEN