==Special Precautions of Flavanoids :==
* The only flavonoid shown to have negative side-effects in humans is catechin; large doses may cause fever, anemia and hives, but these symptoms are ameliorated once catechin supplementation is discontinued. Flavonoids often work in conjunction with vitamin C; large amounts can help improve the absorption of vitamin C in the body.Flavonoids may interact with some drugs used to treat shingles and chickenpox, such as acyclovir. Patients taking these drugs should consult with a licensed health care provider before taking flavonoid supplements. As always, patients should speak with a licensed health care practitioner before taking flavonoids or any other dietary supplements or herbal remedies.
* In vitro and in vivo laboratory data point to chemoprotective effects of flavonoids on colorectal cancer. However, there has been limited epidemiologic research on the dietary intake of flavonoids and risk of Colon Cancer.
* See also precautions [[isoflavones]].