No clear toxicity has been identified. Early quercetin research suggested that large amounts of quercetin could cause cancer in animals.42 Most,43, 44, 45 but not all,46 current research finds quercetin to be safe or actually linked to protection from cancer.
Quercetin has been shown to cause chromosomal mutations in certain bacteria in test tube studies.47 Although the significance of this finding for humans is not clear, some doctors are concerned about the possibility that birth defects could occur in the offspring of people supplementing with quercetin at the time of conception or during pregnancy.
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The information presented in Aisle7 is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. Self-treatment is not recommended for life-threatening conditions that require medical treatment under a doctor's care. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires June 2015.