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The effects of this herbal stimulant are similar to caffeine. Ginkgo, also known as ginkgo biloba, is a well-known type of natural stimulant. The stimulant properties of this plant are said to improve circulation and brain function. Many physicians recommend ginkgo supplements to prevent memory and concentration problems associated with age.
But last month, scientists released the first government toxicology study of ginkgo biloba, which found that the extract â one of the top-selling herbal supplements in the country â caused cancer in lab animals, including an excessive number of liver and thyroid cancers, as well as nasal tumors.