You just administer 1mL, hold it in your mouth for a while, and then swallow
Vitamin B12 Injection Vitamin B12 (cobalamin) is an essential water-soluble vitamin that plays a fundamental role in neurological function, red blood cell production, and DNA synthesis
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There is no established maximum dose for human use, so staying within the 5-10 mg range reflects where the majority of research and anecdotal data lives
Adding more water (5 mL) increases the daily draw to 10 units (easier to measure) but does not solve the shelf-life problem