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Treating with folic acid alone can mask B12 deficiency and potentially worsen neurological outcomes
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Oxidative stress in the scalp from UV radiation, environmental pollutants, and inflammatory processes can damage follicular cells and contribute to premature catagen (regression phase) entry
Annu Rev Biochem
Mass spectrometry can support identity confirmation, but a matching mass alone does not characterize sequence-related impurities, positional isomers, disulfide variants, aggregates, residual reagents, or all degradation products
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