I don't hear nobody in this thread talking about iodine. In the indian study they put betadine(a iodine form) on the scalp. I think this is a underrated point. If u remember 2young2retire also use betadine.
But there is more. In a 2005 case study they investigate about topical iodine(lugol) on wound regeneration and they discover the possibility of hair rigeneration.
https://www.google.com/amp/s/www.re..._A_case_report_An_interim_35_year_summary/amp
". Not all, but most important results are presented. Topical iodine induces hair growth in and around scars."
Also Cotsarelis in one of the follica's patent talk about apply some topical on induced wound. In the list of this topical he includes iodine ond others similar element like lithium.
Resuming : i think we must consider iodine and his derivates (betadine, lugol) not only like disinfectant, but also for their active role in hair regrowth.