case of hospira bac water Bacteriostatic 30ml x 5 Pack Sterile Water for Injection contains no bacteriostat antimicrobial agent or added buffer and is intended only for single dose injection after admixture with an appropriate aolute or solution Hospira Bacteriostatic Water Single Vial

But if your B12 level is normal

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This is harmless and washes off

Chemical substances shall not be used as a drug, medicine, active substance, medical aid, cosmetic product, a substance for production of a cosmetic product neither for human consumption that is any food or food supplement or otherwise similarly used on humans or animals

The benefits of NAD metabolism may be even greater

Methods for the analysis of vitamin B 12 in food Several methods have been used to determine the vitamin B 12 content in foods including microbiological assays, chemiluminescence assays, polarographic, spectrophotometric, and high-performance liquid chromatography processes