Based on this study/article https://www.dailymail.co.uk/science...sts-cure-hair-loss-mice-regrowth-20-days.html
They used a mix of pure oleic and ethanol to create a serum who will in theory irritates the skin but trigger a defense mechanism who will grow new vellus/hair as a "side effect". I said ostrich fat in PG but in reality pure oleic acid and ethanol should do the same job.
Idk if it's worth waiting for a better trial because both compounds are patentable