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That list governs which raw substances state-licensed compounding pharmacies may legally use when preparing a medicine against an individual prescription

Route changes exposure, and rat data cannot provide a safe conversion

[95] Intramuscular or intravenous injection [edit] Injection of hydroxycobalamin is often used if digestive absorption is impaired, [2] but this course of action may not be necessary with high-dose oral supplements (such as 0.51.0 mg or more), [97] [98] because with large quantities of the vitamin taken orally, even the 1% to 5% of free crystalline B 12 that is absorbed along the entire intestine by passive diffusion may be sufficient to provide a necessary amount

There's really no ideal injection site

serious events have not been documented in limited human observations

Those with gastrointestinal tract problems who cannot absorb vitamin B12 properly