Coat of arms. This article is about coat of arms which is only an element of an achievement (heraldic symbol); the expression 'coat of arms' is often erroneously used to refer to the whole achievement . For the whole heraldic symbol, see achievement (heraldry).
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.
Roland Griffiths, a professor of psychiatry and neuroscience at Johns Hopkins University, says that caffeine is the world's most commonly used stimulant. Large quantities of caffeine can decrease blood flow to the brain by as much as 30 percent and can cause severe mood swings and disorders.