- 100% pure Giant Knotweed extract - Boasts 98% trans-resveratrol content - Antioxidant - No additives, fillers or preservatives" Indulge in the unmatched antioxidant power of resveratrol with our premium capsules, crafted meticulously from 100% pure, dried Giant Knotweed extract. KIKI Health's Resveratrol capsules contain an impressive 98% trans-resveratrol content, sourced from the roots of Polygonum cuspidatum, ensuring unparalleled potency. Experience the full spectrum of benefits from this potent antioxidant, whether you're aiming to bolster cardiovascular health, promote youthful aging, or enhance overall vitality.