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The tradeoff versus injection is bioavailability
It is possible that the effects are additive, that they are redundant, or that combining approaches produces unexpected outcomes
It's the standard timeframe cited by manufacturers and the USP (United States Pharmacopeia)
How often should B12 injections be administered for maintenance therapy
For larger doses, a 0.5mL or 1mL syringe works better
Multi-dose vial design also matters
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