Massive fan of NootBro on Twitter and his extensive knowledge of supplements and nootropics are very helpful, so naturally felt the need to support his brand. Unfortunately, I did not feel many effects from this supplement. I am not sure if it depends on the person with how effective it is, but the only time I felt focused when taking it was when I was forcing myself to concentrate, and what I believe is the placebo kicked in, even then it did not seem very effective. Customer service is great and refunded me. Another small criticism I have is that the creators suggest taking it with coffee to enhance focus which I did not do, possibly why it was not effective. I ordered this as a coffee substitute in an attempt to get off caffeine, but it did not have the cognitive effects coffee has for me.