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Adequate levels of B12 are required to prevent anemia
Also, patients should be warned about the danger of taking folic acid in place of vitamin B 12, because the former may prevent anemia but allow progression of subacute combined degeneration
J Clin Endocrinol Metab (1988) 67:118689

Feeling nothing at this dose is completely normal and expected

They look at your medical history , current health, and how you react to treatment

Skin barrier function is another area where peptide research has yielded meaningful results