i’m 31 years old and have 3 good sized bald spots on my head, and the rest of it is very thin. my ponytail now is the size of one of my pigtails 10 years ago. i was tested and was found to have a significant vitamin d deficiency. where levels are generally 50-80, mine is 17. i am taking 50,000 units twice a week as prescribed by my doctor and will be tested again in a few months. my question is this: once my vitamin d is balanced out, will the hair grow back?