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Neurosci Biobehav Rev Iyer KS et al

Low vitamin B12 is one of the most overlooked nutrient deficiencies in women and the symptoms often get dismissed as stress, burnout, or just being tired. But vitamin B12 plays a critical role in energy production, brain health, nerve function, and red blood cell formation

The vertex (crown) often shows different permeability than the frontal hairline, which may explain why some areas respond differently to topical treatments