Red wine gets all the attention, but it isn't the richest dietary source of resveratrol. Gram for gram, that title goes to a berry that grows wild across Scandinavia.
Few plants have a worse reputation than Japanese knotweed. Yet its root is the richest natural source of resveratrol known, and where most supplement-grade resveratrol comes from, including ours.
"Resveratrol" and "trans-resveratrol" sound interchangeable on a supplement label, but those five extra letters tell you which shape of the molecule you're actually getting.