Comment GUT1 to download gut health guide Low ferritin may cause skin and hair-related symptoms, including dark under-eye circles, hair thinning, brittle nails, pale or dry skin, slow wound healing, itching, and a higher risk of skin infections or dermatitis. consider optimal ferritin to be around 90–110 ng/mL for good energy, thyroid function, and especially for hair growth. #anemia #irondeficiency #darkcircles #skintexture #hairthinning #hairloss #nailhealth #nails #hair #skincare #pcos #thyro