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It just goes to show that the 'B12 deficiency is unlikely in someone so young' is probably right most of the time, but not always

Be in good health and not have any current medical conditions that may impede their healing process

Take the treatment, stay safe, and then sort out the missed fast afterward with a trusted scholar if you need personal guidance
[DOI] [PubMed] [Google Scholar] 115.Banks M.F., Stipanuk M.H

Peptide-Based Vaccination Therapy for Rheumatic Diseases