I am pretty sure tribestan by Sopharma was the firstproduct to come out. is supposed to increase LH and raise natural testosterone levels. Supplement companies now claim the component of trib. that is responsible for raising LH/ test is protodioscin. claims to have a higher concentration of protodioscin. The problem is there really haven't been any studies to support these claims. Sopharma did one or two. Their studies showed the trib. raised testosterone levels by 30% but also showed the it raised estrogen levels by close to 80 %. I tried tribestan by Sopharma when it first came out and I wasn't that impressed with it. I haven't tried the other brand but it looks like they are hoping people mistake it for the sopharma brand. Sopharma was the only company to put their trib. in a box, now ThermoLife is doing it.There is some debate if trib. even works at all.