I just had an endcron (spelling?) check me out. My thyroid is normal but on the low end. She wants to retest my thyroid levels in about another 3 months. My vitamin b levels came back as 23 the normal range is 40 - 70. There is no history of hair loss in my family. I still have my hair line its just kind of thinned out. I was wondering if anyone had taken vitamin b and improved their hair? I'm 24 years old.