Polyphenols are a group of antioxidant-like substances that you normally get from food. Foods with the highest polyphenol content are mainly turmeric, red wine grapes, green tea, broccoli and various citrus fruits. Bioflavonoids are polyphenols found mainly in citrus fruits. Relevant here is that there may be a link between the presence of bioflavonoids in the diet and bioflavonoids enhancing the effect of vitamin C. Various scientific findings show that bioflavonoids reduce any vitamin C breakdown in the body. The body is therefore better able to absorb vitamin C. Finally, in addition to Citrus bioflavonoids, rutin is also a bioflavonoid that has been widely researched by scientists and to which great value is attached in therapeutic use.