does a b12 injection make you tired

nutritional supplement https://www.neova.com/cdn/shop/files/tricomin-1_-ahk-cu-treatment-spray-front.jpg?v=1776709696&width=1945 Why is vitamin B12 important for immunity? Vitamin B12, also called cobalamin, is essential for producing new DNA, forming healthy red blood cells and maintaining normal nerve function. Because immune cells need Size:1000 mcg/ml - 10 ml x 1 Is there an out-of-pocket limit or maximum on my insurance plan

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