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Intramuscular (IM) : Common sites include the upper arm (deltoid muscle), thigh (vastus lateralis), or buttocks (gluteus medius)

Mayo Clinic - Vitamin B12 deficiency anemia National Institutes of Health (NIH) - Vitamin B12 Fact Sheet for Health Professionals Harvard Health Publishing - Vitamin B12 deficiency: What to know NHS (National Health Service) - Vitamin B12 or folate deficiency anemia American Academy of Family Physicians - Diagnosis and Treatment of Vitamin B12 Deficiency

General guidelines suggest individuals under 150 pounds may start with 50-75mg daily, those between 150 and 200 pounds typically use 75mg daily as a standard protocol, and individuals over 200 pounds may need 75-100mg daily for optimal effects

FDA 503A Category 2 (April 2026) On April 15, 2026, the FDA published a 503A bulks list update