vitamin b12 1mg injection Compounded Cyanocobalamin (Vitamin B12) and protein and nerve metabolism Vitamin B12 Injection – Manufacturer
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doi: 10.1016/s0378-1119(01)00559-5

That includes one of the most important: the immune system

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Enhanced Mood and Cognitive Function: Supports mental clarity and emotional well-being

According to Harvard Health Publishing, you need to get nearly 30 different vitamins and minerals from the foods you eat, because your body isn't able to produce these nutrients in sufficient amounts

A washout period of at least several weeks is advisable, though specific recommendations cannot be made given limited data
