It is normally withdrawn, mixed with the drug, and then that mixture is injected (usually intramuscularly or subcutaneously, as indicated for the drug)
Symptoms of Vitamin B-12 Deficiency Fatigue and Weakness Low Moods Low Concentration Level Loss of Appetite Constipation Poor Memory Foods Rich in Vitamin B-12 Beef and chicken liver Wild-caught fish such as salmon, trout, and tuna Grass-fed beef and lamb Pasture-raised poultry Organic dairy products like milk and yogurt Who Is Most Likely to Have a Vitamin B-12 Deficiency
doi: 10.1517/14728214.13.2.383
Toole JF, Malinow MR, Chambless LE, Spence JD, Pettigrew LC, Howard VJ, Sides EG, Wang CH, Stampfer M
The FDA's leadership still has to weigh in
The cobalamin forms and analogues in plasma and myeloid cells during the course of chronic myelogenous leukemia related to the clinical condition