This is Now's L-tyrosine, everything Now puts out is solid, they are a reputable company. As far as L-tyrosine's effects, it's pretty dependent on a lot of things, sometimes it makes me feel fantastic (w/ a slight libido boost) sometimes i get nothing from it. Weird compound as you can't judge what effect it's going to have on you from day to day.
[5 of 5 Stars!]
