Wendy and I have been enjoying a new to us natural stimulant. It is a stacked smart drug mix of 450mg of artichoke extract and 125mg (20% pure) forskolin. We both felt several hours of focus without the usual thought distractions. It does not feel at all like caffeine in terms of being speedy or making us more alert. It provides a clarity that seems to turn down the volume on the usual distracting thoughts that I normally have. You find lots of discussions on-line and pickup both bottles for less than $20 combined. Timothy Ferriss recently popularized this mix by mentioning it in several interviews.