Scalp RenewalNutrition, stress and shedding
5 min read
The handful of inputs with real evidence behind them, and the ones that are mostly marketing.
What has evidence
Iron status (ferritin), thyroid function, protein intake and vitamin D are the inputs most consistently linked to diffuse shedding. Ask your clinician for labs before supplementing anything.
Chronic sleep debt and sustained cortisol elevation push follicles into telogen early. Sleep is not a soft recommendation here.
What is mostly noise
Megadosing biotin without a documented deficiency does little for hair and can distort thyroid and cardiac lab results.
Scalp scrubs and heavy oils can help comfort and adherence but do not change follicle biology on their own.