Love love love. Natural, but noticeable difference. NO jitters. 

This is the one. It gives me the perfect balance of feeling "awake" but not jitters or other weird stimulant effects. I believe that it interacts with the body's endocannabinoid system to provide assistance vs disruption. I also feel overall mental clarity. Dosages may vary from person to person. Two to three under the tongue for 20 seconds seems to do it for me.