Tribulus saponins

Does anyone know what the difference is btw different trib products that offer different %'s of saponins. I am taking vitamin shoppe's trib and it is 20% saponins and $10 a bottle. They also offer trib 40% saponins but its about $20 a bottle

Is the cost difference worth the extra saponins? I am doing pct right now and anything that will help me get back to normal ill take, just wondering if the price difference is worth it

-Helios

Saponins are the active ingredient, its what stimulates test production. So yes, the Different % do mean something and the higher the %, the better it is.