1. haidut

    Reducing Stress May Reverse Greying Of Hair

    Just a few weeks ago I made a post about yet another study linking grey hair to increased stress. The mechanism of action described in that study was increased HPA activity and specifically elevated norepinephrine levels. Other studies have also implicated tryptophan/serotonin, which is still...
  2. haidut

    Estrogen Darkens Skin Color, Progesterone Lightens It

    It has been known since ancient Greek times that during pregnancy skin color in women changes drastically. Doctors have long suspected that hormones are involved but until now the mechanism was not known. This study shows that estrogen and progesterone are involved in skin color changes...