I'm personally not convinced that Cissus lowers cortisol. From user feedback, we've seen that lowered cortisol is hard on the joint and tendons, whereas Cissus is obviously having the opposite effect.
EDIT: My mistake, cortisol is bad for tendons. But like I mentioned, no one is having joint problems (at least from what I've seen). Perhaps there is selective GR modulation going on here with Cissus?