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Route, Dosage, and Frequency Basics The Vitamin B12 injection route is commonly intramuscular or deep subcutaneous, depending on the product label and clinical direction

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It also plays a role in protecting B12 from being destroyed by stomach acid, such as in the stomach and intestines.[ref] TCN2 (transcobalamin II, TCN2 gene): TCN2 is a B12 transport protein that moves vitamin B12 from the bloodstream into cells throughout the body

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Collagen peptides have more human data on knee osteoarthritis symptoms, but even there, results are mixed and effect sizes are often modest

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