Vitamin B12 injections deliver high doses of this essential vitamin directly into your bloodstream for better absorption than oral supplements to boost energy, support red blood cell production and maintain nerve function. How to Avoid D53.9, D51.x, and D64.9 in Macrocytic Anemia ICD 10 CM Diagnosis Code R29.898 Other symptoms and signs involving the musculoskeletal system Vitamin B12 (cobalamin) and folate (vitamin B9) are vitamins that serve important functions in the human body. Folate is needed for development and growth of cells (including red blood cells) and synthesis