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See your GP for a blood test first If you are on metformin and have symptoms that could point to low B12, the first step is a GP blood test, not a private injection
Because your body does not readily store excess amounts, toxicity from B12 is very unlikely, even at the higher doses used in injections
Zaman Javaheri, M.D
Subcutaneous injection bypasses all of these barriers except plasma half-life, which for unmodified small peptides is generally very short (minutes to low hours, based on class-level pharmacokinetic data for similar unmodified peptides)
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