But, every few years my thyroid just burns out, and I go hypo. When I do I experience extreme
hair loss and brittle nails. For me, the animal based thyroid substitutes work much better when I'm in a hypo phase. Additionally, sometimes when I am not hypo, the medication I take for my Graves' just knocks down my T4/T3 levels so low that once again I start to lose a lot of hair.