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It has been clearly demonstrated that altered circulating thyroid hormone is associated with various mental signs and symptoms, such as emotional disturbances (impulsiveness, irritability), cognitive deficits (impairments in memory, concentration, attention, planning, and productivity), and affective symptoms (anxiety, depression, mania), which increase the incidence of neuropsychiatric disorder like depression (111)
In a separate head-to-head comparison, GHK-Cu outperformed both retinol (vitamin A) and vitamin C in improving skin firmness and elasticity, and it did so without the irritation, photosensitivity, or adjustment period associated with retinoid use
In fact, they can help calm irritated, sensitive, or acne-prone skin by repairing the skin barrier and reducing inflammation
10.1016/j.freeradbiomed.2014.01.010 Free Radic
