Oral therapies and ultra long acting injectables are two distinct strategies to improve patient and healthcare system outcomes
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We know that B12 recovery from bile would be a problem but this only contributes 5mcg to the picture, so I think its an open question
True B12 deficiency can show up as increased shedding, brittle hair, slow regrowth, and pale or inflamed skin especially in vegans, older adults, and people on certain medications
A useful way to read the mechanism literature is to separate three levels of evidence
If you experience any electric shock sensations, numbness, or tingling during injection, stop immediately and reposition