I've added to my minoxidil at 10%. Like you said, it's cheap and dissolves well. It's supposed to speed up hair growth so hopefully the results from other treatments will come quicklyCurrently using MSM at 7.5% in a hair lotion that I compound myself with a plethora of other AIs.
I do also have MAP but don't use it in this formulation because I also have AHK-Cu in it and I don't wanna mix them together.
I highly doubt it's effective for regrowth but could possibly help with growth. It does have a low MW as well, so no problems with penetrating the SC.
It's cheap and has near-perfect dissolution kinetics, so it's very easy to add to any topical.