Both Fisetin and Resveratrol are relatively insoluble in water, so dissolving a mix in water and rubbing it on your scalp probably wouldn't work.  However, both are rather soluble in ethyl alcohol, so that might be a key to applying them in a hair regrowth test.

Hi Michael, JGC. let's try. Did you have results?
What about mix fisetin it in oil then apply it to the scalp/skin for rejuvenation purpose. some people on this forum report white hair reversing to grey, but not topical experiences, just oral route.