Vitamin B12, or cobalamin, is essential for the production of red blood cells and the maintenance of a healthy nervous system
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Key Benefits: Dilution for Injectable Medications: Used for preparing medications requiring dilution before intravenous (IV), intramuscular (IM), or subcutaneous (SC) administration
Given the many intricacies of the immune system and individual quirks, not feeling pain is normal, too, says William Moss, an epidemiologist and executive director of the International Vaccine Access Center at the Johns Hopkins School of Public Health in Baltimore
Here are some cases: A 52-year-old woman reacted to an intramuscular cyanocobalamin B12 shot, but later received oral B12 with no adverse effects