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See the 2026 updates section of this guide for the complete breakdown with source citations

BMJ 2021;375:n3144

Route: Subcutaneous, Intramuscular or slow Intravenous injection

Metabolic Support B12 contributes to healthy metabolism through several pathways: Assists in converting food to energy rather than stored fat Supports thyroid function, which regulates metabolism Helps maintain efficient cellular energy production Provides energy needed for physical activity This metabolic support can complement weight management efforts as part of a comprehensive approach

How Vitamin B12 helps the body Vitamin B12 Deficiency Vitamin B12 deficiency occurs when the body lacks an adequate amount of vitamin B12 to maintain optimal health and functioning