They are SARMs. Performance enhancing drugs that target androgen receptors without the potential risk of severe adverse effects like anabolic steroids, however, they are research chemicals and research is limited and "not approved for human consumption. They are banned in major sports though.
along with RAD140 and LGD4033, I added GW501516 and MK677 along with modafinil.
The GW is an endurance booster and is a PPAR-delta agonist. Makes my running and working out last much longer without feeling tired, and MK677 stimulates the release of growth hormone. They're all research chemicals, with a a grey area in law and not illegal as long as it's not sold for "human consumption". With all the busts in professional athletes getting caught using them might become illegal soon I'm guessing.
Never dealt with PEDs until 4 weeks ago, but wow, I can see why they're enjoyable. I felt like I needed a little boost after laying off the heroin and cocaine, to get back to a "healthy" lifestyle. Not that I condone it hehe. As with all good things, it will always come to an end, which is something I have to keep in mind.