Question: what are the vitamins to prevent hair loss?
Answer: Multivitamin. Scientists have determined that vitamins A, B, C, D, iron, selenium, and zinc are all important to the hair growth and retention processes, specifically with cell turnover. ... 
Vitamin D. One 2018 study noted that vitamin D is associated with nonscarring alopecia. ... 
Biotin. ... 
Saw palmetto. ... 
Ginseng.