I brew my on stuff...Everything from Test E, Tren E, Mast, Primo E, Winstrol and Anavar (oral liquid)...I have used a couple of their products Tren E and Test E and Winstrol...I can say myself what I brew hits me much sooner and stronger. My Winstrol is day and night better, period. But got results regardless. Have a boy who uses only their products and looks fantastic so something is working. Wither its underdosed, well not even going to go there because I have no clue. If they are under dosing would make no sense, they make their products in China and acquire their compound within China. They got to be getting their raws cheaper than what China is retailing for, say $****per 1000gram of Test E (didnt read forum rules, dont want to put pricing out). Who I would watch out for is Domestic US and Foreign UGL's selling product cheap. No one is going to take the risk of purchasing, producing and distributing product at dog cheap prices and take the risk of getting popped. I know one of these guys personally, not naming names. Sells under two different names, cheap stuff is underdosed, sometimes as much 50%. Then he sells a higher quality product obviously at a higher price..Gets both types of clients, bargain buyers etc and guys who are willing to pay alittle extra to get what it says on the bottle. All comes to about the same, just has to work more with the cheaper stuff. Again you get what you pay for. Stay away from the things that are to good to be true.