Endocrine therapy-induced hair loss (ETIHL)

As a general principle, I would check all supplements with your medical team. If you have a good varied diet, additional vitamin C may not help much. More than one doctor has described vitamin C supplements as creating more expensive urine. But topical application may be different. I do take vitamin D (like many women, my vitamin D level was found to be low right at the start of treatment) and fish oil, and have done so through treatment and beyond. Folic acid is important if you are pregnant, ie building cells! So maybe not, certainly not without advice. Hair regrowth is very variable, for all sorts of reasons, texture and colour can change over quite a long period. A cream or shampoo form may be best, but check ‘em all, if only not to waste money. Best wishes.