Nature's Plus Ultra Vitamin D3 provides 5000 IU of vitamin D3, the 21st Century wonder-vitamin, supercharged with 25 mg of Trans-Resveratrol - nutrition science's most powerful antioxidant anti-aging nutrient. The Herbal Antioxidant Polyphenol Complex and vegetable cellulose extended-release delivery system maximize this powerful combination, for full-body, complete systemic rejuvenation unlike any supplement on the market.