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is bac water safe Bacteriostatic | USP Grade Bac Water: A Clear Guide
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Most logged side effects Side effects are logged separately from overall experience

Neo-B12 Injection is also used to treat and prevent other forms of macrocytic anaemias caused by vitamin B12 deficiency, in which red blood cells that are larger than normal size result in a lack of haemoglobin

I dont that it is "illegal as such"

The math is less clean, but the injection volumes are very small, which some researchers prefer
From a health perspective, not drinking at all is best