6-OXO from ErgoPharm:

The era of prohormones has come to an end. As the originators and leaders of the whole prohormone phenomenon, Ergopharm looks at this time with sadness and regret. At the same time however, we see it as a time of enormous excitement and promise because we truly believe that we have developed the most effective and safest testosterone booster ever. Best of all, this product is both natural and non-hormonal, so it is and will remain legally available for a long time to come!!