Grapeseed extract causes destruction of cancer cells while leaving normals cells untouched. However, you have to have enough of it for it to induce cancer destruction, otherwise it acts as a more conventional antioxidant.
It works against cancer even when the cancer has become cisplaten resistant and the p53 gene goes bad.
(Reminds of of how peer-reviewed double-blind studies showed that L-carnitine fumarate could limit damage to the heart muscle even if given *after* the onset of a heart attack. Something about fatty acid transport into the mitochondria enabling the heart to do its thing with less oxygen.)