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Doctors can diagnose vitamin B12 deficiency can be diagnosed through blood tests, including a complete blood count and methylmalonic acid test, to measure B12 levels and metabolic function
However, theres no difference in the time of day youre injecting
We know that B12 recovery from bile would be a problem but this only contributes 5mcg to the picture, so I think its an open question
Expired vitamin solutions may have reduced potency and an increased chance of contamination or chemical breakdown
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