evidence: The use of herbs is a time-honored approach to strengthening the body and treating disease. However, herbs can trigger side effects and interact with other herbs, supplements, or medications. For these reasons, herbs should be taken with care, under the supervision of a health care provider qualified in the field of botanical medicine. [...] May BH, Lit M, Xue CC, Yang AW, Zhang AL, Owens MD, et al. Herbal medicine for dementia: a systematic review. Phytother Res. 2008 Dec 11;23(4):447-459. [...] Vellas B, Coley N, Ousset PJ, et al.; GuidAge Study Group. Long-term use of standardised Ginkgo biloba extract for the prevention of Alzheimer's disease (GuidAge): a randomised placebo-controlled trial. Lancet Neurol. 2012 Oct;11(10):851-9. doi: 10.1016/S1474-4422(12)70206-5. Review.