Im sitting here after just applying rosemary, castor and pumpkin seed.. Who knows if nothing the essential oil seems very stimulatory, washing with cold water afterward really gives a "menthol" response.. esp with peppermint but somewhere I recall that it interferes with minoxidil I can't remember where I saw that..
But oils aren't nothing, Im not certain but rosemary may inhibit DHT, as pumpkin seed is supposed to (although I don't know about topically), and castor is known to be a PGD2 inhibitor which is definitely something. Not only that but the use of various things commonly used like nizoral, zinc shampoo, or minoxidil dry hair out badly, and the oiling, if washed carefully and not too thoroughly, leaves some oil behind on the hair.