b12 injected into blood vessel Vitamin B12—Multifaceted In Vivo Functions and In Vitro Applications B12 Shots vs. IV Infusions:

Rarely, allergic reactions can occur, presenting as hives, difficulty breathing, or swelling of the face, lips, tongue, or throat

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Remember that these injections aren't magic weight loss solutions

Role of Vitamin B12 in the Body Vitamin B12 is a water-soluble vitamin belonging to the B vitamin group and plays several important roles in the body, including: DNA Synthesis: It is involved in the synthesis of DNA, making it crucial for cell division and reproduction