He's warned in hypothyroid people DHEA can possibly convert to estrogen. In a healthy person it can help regenerative things. Pregnenolone is the safer hormone for sick people. In my opinion no hormones are safe to mess with when your sick, especially when the purity of the hormones is questionable.
Btw I asked Peat about nofap and semen retention etc he didnt specifically address fapping part but said just thinking about and anticipating sex increases testosterone and makes the whiskers grow faster. interestingly he added that its possible in a stressed hypothyroid person the increased testosterone could convert to estrogen.