Wondering about it as well. I have 4 mdxt and 2 mm.
Currently on day 6 of mdxt after a few weeks of dermacrine. Noticeable blood pressure rise (feeling in the face along with testing it) even with taking cycle support 3 times per day and 1g of hawth berry. Some back pump so supplementing taurine and a bit of night sweats so far. Strength was up today on biceps so don't know. Would think it has to be something besides bioperine.
Think Need2 sent both in for testing.