I'd be curious to know any results as well from anyone who's tried it.
As for shutdown, I've heard both sides.
Quote from cantstopeating:
"I've read, through haidut, that Peat recommends about 1-3mg of DHT a day if you choose to use it."
I'd imagine there would be differing effects based on the dose, as with DHEA, which stimulates androgenic activity in low doses with estrogenic activity in higher doses.
I emailed the website and the owner claims that DHT cannot shut you down....