Bests & Worsts Reviews from Amazon

This didn't work for me because I am extremely prone to migraines and headaches in general. This stuff triggered some bad headaches and 1 really bad migraine but I don't see that as a reason to give it a poor rating just because I'm sensitive to it. In Between headaches I actually had fantastic energy using this but I couldn't use it for long. If you aren't sensitive to tyrosine than this should be a fantastic energy booster for you. But if you suffer from migraines, I would steer clear of this stuff.