I have always had big hair very thick . im 62 yrs old but my hair seems thinner than I ever remember . my hair has not had any perms in over 2yrs when ifirst noticed the thinning . my doctor takes blood test every so often. I m taking vitamin D for a year . Can that help my hair or just bones. Im now going to tell my beautician , not to use blow drying and just shampoo. my hair is still long but getting thin. She just trimmed the ends. What do you think Doctor .