1) Here's a post here on HairLossTalk.com showing a diagram of what Kythera's current study/hypothesis (and this thread) is all about that I was able to find through google:
https://www.hairlosstalk.com/interact/threads/setipiprant-frequently-asked-questions.111509/
But I'll admit I mispoke above. I didn't mean to say PGD2 is
directly downstream from DHT, but rather DHT increases PTGDS, which in turn increases PGD2 downstream from ARA. Here's an easy diagram to visualize my initial statement that less DHT = less PGD2:
View attachment 90696
2) By "hitting" I didn't mean "damaging", if that's what you're getting at. You've got blood vessels all throughout your scalp, and they're attached to and "feed" your follicles. Good luck putting something on your scalp that will reach your follicles and not your bloodstream. So you don't have to google that:
View attachment 90697
3) That's a quarter of a percent solution. TINY. Here's the full study, which concludes that, "A strong and similar inhibition of plasma DHT was found after 1 week of treatment with the topical and tablet finasteride formulations, albeit finasteride plasma exposure was significantly lower with the topical than with the oral product (p<0.0001)."
https://www.researchgate.net/profil...ndrogen-levels-in-healthy-male-volunteers.pdf Again, b/c finasteride is a suicide inhibitor, plasma exposure in any amount is still plasma exposure. That's why people continue to report sides on HandW's topical product, and why other attempts at a topical DHT-inhibitor have all failed so far.
5) If a study's already been posted in this very forum, do you honestly expect users to repost it every time they make mention of it? It's not my job to educate you. You can either read up yourself (like I did) or you can continue to stay in the dark and shout "broscience" at your leisure. Totally your call, man.