Assuming you're supplementing them to curtail the symptoms of M.P.B./Androgenetic Alopecia I've yet to see/hear of any of them doing much to stop or counter hair fall. Yes all three have been thought to aid in promoting and/or maintaining healthy hair, but the problem with that rationale is that we Androgenetic Alopecia folks no longer have healthy hair in due part to the follicular ravaging downstream effects of DHT. There is some promising evidence that zinc, selenium may generally help improve or support the immune system so taken in safely recommended dosages they may have some complimentary value.