Vanilla extract has a long history of use in the Americas not only as a flavoring, but also as an aphrodisiac, sedative, antidepressant and sleep aid. The ability of vanilla extract to affect hormones of the body and neurotransmitters of the brain is not well established by scientific studies, although many decades of anecdotal claims make it an intriguing possibility. Many other herbal remedies, such as Valerian root, chamomile and passion fruit, are proven to alter mood, so the potential certainly exists for vanilla bean. If the taste or scent of vanilla is relaxing for most people, that would explain why it’s commonly used in candles and potpourri.