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Yes, but people with absorption issues (due to age, diet, or health conditions) may not get sufficient B12 from pills alone
But for most purposes (like weekly maintenance injections), IM is the preferred route at home because its simpler (the vitamins absorb quickly from muscle into the bloodstream over a few hours)
The standard dose then lands on 0.1 mL, or 10 units on a U-100 syringe
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