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Stress, sleep, and immune signals: why skin and hair react When stress runs high, cortisol can rise, sleep can break, and blood sugar can swing, and those shifts can show up on the face and scalp fast, even in people with a good routine
It has growth-regulating, insulin-like, mitogenic activities
maintenance becomes the new challenge
GLP-1, a gut hormone that regulates blood sugar, appears to lose function as we get older
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