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For these individuals, vitamin B12 injections are often the most effective way to restore healthy B12 levels because they bypass the digestive system entirely, delivering the vitamin directly into the bloodstream for maximum absorption (around 95% compared to 25-50% for oral supplements)
For serious healing, injectable peptides are necessary
Concurrent medications (metformin, PPIs, antibiotics) and underlying gastrointestinal conditions may cause diarrhoea coinciding with B12 supplementation
Zsiros V, Aradi I, Maccaferri G
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