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Intramuscular B12 injections produce faster results than oral supplementation, with reticulocytosis typically beginning by day 34 of treatment
Endocrinology, Diabetes & Metabolism, 2 (4), e00082
While still highly significant versus baseline, the high-dose group actually produced fewer new hairs than the low-dose group consistent with the biphasic dose-response seen in the 2007 Pyo laboratory study where higher copper peptide concentrations inhibited rather than stimulated growth
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