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It is classified as an unapproved drug
Some people prefer morning use, but evidence does not show that all patients must avoid evening dosing or take it on an empty stomach
There are practical reasons too: B can be unstable if mixed with certain other vitamins in solution, and dosing schedules for B deficiency (pernicious anemia, for instance) may differ
Free shipping thresholds differ widely and can swing the effective cost of a single-vial order
The peptide also tolerates lyophilisation and reconstitution without measurable loss of activity, and stable storage at -20C exceeds 24 months in published shelf-life data
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