https://bmccomplementalternmed.biomedcentral.com/articles/10.1186/1472-6882-5-1, Sreemantula, S.; Nammi, S.; Kolanukonda, R.; Koppula, S.; Boini, K.M.: Adaptogenic and nootropic activities of aqueous extract of Vitis vinifera (grape seed): an experimental study in rat model: The official journal of the International Society for Complementary Medicine Research (ISCMR)2005.