Left: Ginkgo tree with fruits rich in polyphenols. Right: Ginkgo biloba significantly reduces systemic oxidative stress in glaucoma patients. From Fang L, Neutzner A, Turtschi S, Flammer J, Mozaffarieh M. The effect of Gingko biloba and nifedipine on DNA breaks in circulating leukocytes of glaucoma patients. Expert Rev. Ophthalmol. 10(3), 313–318 (2015)