Levothyroxine
"I had really brittle nails and was tired all of the time. I went to my doctors and she did a T4 blood test and found that I had hypothyroidism and she put me on Levothyroxine and within a month my hair and nails were less brittle and more soft. I am happy to have the energy to do things as well as have my soft hair and strong and fast growing nails back!"