Use some mucuna that I grow here on the farm. I don't use it much..only when I need more strength and speed than usual. It is fairly easy to grow...but the harvesting and preparation is time consuming (but worth it when I "Need a bean" to be able to pull start a rototiller or weed-eater. I think they would be illegal for olympic competition! I have friend that take mucuna capsules from Swansons Health Products...seems to be a good brand.