Alright I just did a Google search on this and this is what I've found, maybe someone here can decipher this for me. All mumbo jumbo to me might as well be in another language
The active compound in Tren 13-Ethyl by NRG-X Labs is 13-ethyl-3-methoxy-gona-2,5(10)-diene-17-one. I find it unlikely that there are very many aware of this structure, but it is certainly worth discussing. It is legal because it is a progestin, and before anyone thinks "birth-control", remember that trenbolone, nandrolone, methyltrienolone and Methyl-Dien are all progestins. I doubt anyone will dispute the effects of these compounds upon favorable body composition. But they do all have one bad effect to put an end to... (I should add as a relevant comparison that Clomid and Nolvadex are estrogens...and how many males have rid themselves of feminizing effects plus increased natural testosterone production with them?)
As a progestin, Tren 13-Ethyl by NRG-X Labs is structurally related to the so-called abortion pill RU-486 and as such acts as an "anti-progesterone". Yes, this means decreased estrogen-like effects and an increase in libido. This is likely why so many testers have referred to Tren 13-Ethyl by NRG-X Labs as the anti-Deca-Dick/Tren-Dick product. Research suggests that Tren 13-Ethyl by NRG-X Labs has a half-life of about 6 hours, though it appears that it is closer to 10 hours based upon plasma levels maintained in our test subjects. It is not a 17-alkylated analog thus having very low potential for liver toxicity. However, it should be noted that oral bioavailability is significant as a administration protocol of 25mg 3 times daily provides about the same results as 10mg 2 times daily of ErgoTren 13-Ethyl by NRG-X Labs in regard to body composition effects, strength and lean mass.
Progestins do not aromatize to estrogens and being a 5-alpha-reduced analog prevents conversion to DHT. It is important to remember that being 5-alpha-reduced also means it is related to DHT. Hmmm, 5-alpha reduced means good high quality hardening effects, too. Naturally the lack of estrogenic activity translates into low water retention and solid gains. Due to non-aromatization to estrogens, there is a lower potential for HPTA inhibition from use. This does not mean that there is none, just less to deal with post use. Remember that there are two HPTA negative feed-back loops (Please see Ultra Hot info). 4-8 weeks of continuous Tren 13-Ethyl by NRG-X Labs administration provides good results. And yes, I do suggest the use of Ultra Hot for 4-6 weeks before repeating.