I found Herby through a tweet the founder made. I love all thing health and wellness and when you mix a subscription in with that, I am all in. They offered 2 boxes at the time I purchased and I opted for the Athene Tea box which was said to improve focus. After taking the tea for 4 days, I definitely noticed a difference in the time it took for me to "get focused".
What I will say is that you should go into this thinking you'll drink this tea and get superpowers immediately. You have to also follow a well-balanced diet and they provide a leaflet on all their recommendations (they provide really great insights and information with your order). The founders are also really lovely and each to reach if you need any support.