There are two schools of though, regarding combining tongkat ali and butea superba. But both schools agree on one thing: that taking both is better than just one.
The traditional school prescribes that tongkat ali and butea superba be alternated. Take either of the two for two weeks or so, then switch.
The young turks on the other hand claim that the two should be consumed at the same time as a double punch, eliminating the necessity to cycle. They also claim that the combination is more powerful than either of the two, for testosterone as well as libido.