prohealth longevity 1000 mg trans resveratrol plus 420 mg certified organic polyphenol complex that improves absorption up to 1544% prohealth regular resveratrol is composed of 50% trans-resveratrol and 50% cis-resveratrol; research suggests that only the trans-form has valuable biological activity. therefore, prohealth's trans-resveratrol delivers 1000mg of pure, natural trans-resveratrol per serving. organic co-factors and bioperine included in this formula can improve absorption & c-max blood levels up to 1544%. ** herbal products such as this are likely to have minor color variation from batch to batch because of the geographical and seasonal variations of the raw material.