tribulus terrestris is a plant extract which claims to boost testosterone through increased LH.
It hasn't been proven to boost testosterone.. and furthermore, I don't think an increase in LH -> an increase in Test
I don't know about t-bol but Mass FX has 25R-diol and Nettle Root extract.
Nettle Root extract increases useable (free) testosterone by binding to SHBG molecules hence preventing SHBG from binding to testosterone. SHBG on a fine day binds to about 93% of total testosterone produced in males 21 and older, and as a result that testosterone becomes unuseable*
25R-diol is a myth as far as i'm concerned. But the claims are that it is a strong anabolic manufacture but it's a weak androgenic one. As a result it will build good muscle mass but without the side effects of natural androgenic hormone production being inhibited. Great in theory... but not proven..
*no reference