I just bought 1 and 1/2 pounds of Ginkgo leaves and found how to make homemade tinctures. The only thing is I have found that some sites IN GENERAL say not to take it for to long. But they do not specify on witch ones or how long is to long. The sole purpose for me is I hear it has great effects on helping the memory witch I have had bad problems with sense I was a toddler. And I am really out of ideas. If anyone knows anything about this it would be greatly appreciated. Thanks, Chris