I did my research on this company and they ranked the best… When making my purchase of the caffeine pen, I decided to try the smaller one (cheaper), big mistake. The one up from this actually has more caffeine, which I knew I need, since I was raised on tea and coffee. The one that I purchased didn’t work for me. I love Minty vapes, so I purchased the Arctic Mint and love this flavor!!! I will definitely purchase the product with the most caffeine next time. I’m now a fan of this company for too many reasons to list, so as a fault of my own, I definitely recommend this product 100%