Is it true that is not recommended to use topical products that contain minoxidil and Zinc PCA at the same time? Right now, I’m using finasteride and minoxidil but I want to add Alpecin ASL (that contains caffeine and Zinc PCA) because that lotion had a great effect on my hair growth after 7 months of use when I use it few years ago.The problem is that I read somewhere online that Zinc PCA blocks the penetration of minoxidil. Is it true or false?
The use of zinc shampoos (topical) was studied in conjunction with minoxidil, but it wasn’t shown to offer more than minoxidil itself (see here).
I haven’t read anything that says zinc PCA (pyrrolidone carboxylic acid) would block minoxidil penetration, though. You can contact the maker of the Alpecin lotion to find out what their thoughts are, but that’s a new one to me.