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Vitamin B12, also known as cobalamin, is an essential vitamin that your body needs to function properly
Helps prevent hair loss, breakage, and split ends
Severe reactions like anaphylaxis need emergency care
You might be told to take a B12 injection
Use over-the-counter remedies like antacids to help your stomach settle or non-steroidal anti-inflammatory drugs (NSAIDs) like aspirin or ibuprofen for headaches
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