US$ 24.69
b1 b6 b12 injection dose VITAMIN Vitamin B1 B6 B12 Injection,
Description
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AOD-9604 (-9604), 30 100

A serum B 12 concentration below 148 pmol/L (depending on the assay) with symptoms (box 1) is a strong indication of deficiency and is sufficient to start treatment

However you often and easily blunt the first needle drawing up the fluid from the glass vial so I think it's always recommended to switch to a new second smaller needle for the injection
