Hey, the feedback we got is that the effects are there for an extended period of time (guys take it before gym). I know there have historically been extracts 3:1 or 4:1 from Asia mostly, and they were of poor quality. One of the key points in making a strong extract is filtration - at that point if done incorrectly, you can filter out a lot of the active compound and then from 10:1 it can become 2:1. That is why we are focusing on the exact number of mitragynine, and it gets tested multiple time