According to
this, the test used to indicate thyroid function actually doesn't test the thyroid at all, it tests a hormone secreted by the pituitary gland based on the
theory that this hormone indicates thyroid status.
The theory does not coincide with knowledgeable doctors' experiences with patients or with the patients themselves. In other words, the best hypothyroid doctors and the healthiest hypothyroid patients are the ones who don't see the test as helpful for either diagnosing hypothyroid or even as an indicator of how much thyroid meds are too much or too little, rather it is when matters are primarily determined by symptoms that the most help is found.
So for me, I tested "normal" several years ago, and I'm not bothering to get tested again before trying this dessicated thyroid that I have been prescribed (there's also info on NOT relying on T4 meds). My doctor has said it will be very obvious to me if I'm getting too much, so the plan is to just play it by ear--if I get relief from some symptoms I'll know I was hypothyroid and need this, if I instead get hyperthyroid symptoms then I'll know to leave my thyroid alone.
All that to say,
if the dessicated thyroid helps, then it just might be the answer for my hair too.
There's a whole underground thing about using anti-fungal cream to experience increased hair growth, miconazole nitrate is the one most commonly used, Monistat is the name of the one most commonly used, so I don't doubt that managing candida could make a difference in hair growth.
Here's an informative website on the topical cream with a helpful video. Turns out not only does it increase hair growth, but it also temporarily suspends shedding while you are applying it, but the effect is lost if you stop.