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Research shows that thyroid hormones T3 and T4 have a direct impact on how human hair follicles function

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By the time most patients are in their late 30s or 40s, pineal calcification and reduced melatonin synthesis have already begun degrading sleep architecture, particularly the slow-wave deep sleep phases where cellular repair, growth hormone release, and memory consolidation occur

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10.1038/s41380-020-0793-6 70 MairD.ParisA.ZaloumS