I listened to a podcast that had Paul Bakhtiar as a guest. He was talking about this newer, modified version of Follistatin 344. The use would be to build/maintain/preserve muscle while on glp1's. The issues with 344 is that it can promote tumor growth. FLGR242 is modified to lower that risk. There's a lot that goes into it as I'm just stating the simplest explanation, lol. I see that some vendors have follistatin on their lists and maybe we'll see this new one soon.