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doi: 10.1016/j.envres.2018.06.030 158

This is because issues with regular function of the gastrointestinal tract can prevent the proper release and absorption of the vitamin, which can cause a deficiency if not supplemented properly

[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

This stability is particularly significant for potential oral administration routes [4]

If you're using injectables, you'll need disposable syringes and needles to inject the vitamin b complex