Vitamin B12 Deficiency? Heres the best way to treat it!, Many people take oral or sublingual tablets, but they may not always be effective especially if absorption is poor., The active injectable Vitamin B12 Oral vs Injection What is the best B12 shot for someone with a C677T gene mutation who has reacted poorly to methyl B12 and oral supplements? What is an acceptable oral vitamin B12 (cobalamin) supplement alternative to intramuscular injections for a patient with severely low vitamin B12 levels, particularly those with malabsorption or pernicious anemia? Compounded Cyanocobalamin (Vitamin B12) Injection Empower