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Serotonin Production: B12 contributes to the production of serotonin, a chemical that promotes positive feelings

That language is not just marketing
For musculoskeletal healing, injectable forms have far superior systemic bioavailability and are the standard for research

doi: 10.1016/j.jad.2019.02.051

This also explains why the required treatment dose of oral vitamin B12 may be lower in FCM than in Biermers disease [10]

Vitturi, D.A
