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What is Quercetin?

Quercetin is an active compound naturally found in plants. Tucked away in abundance in fruits and vegetables, quercetin is one of the major flavonoids in our diet. While you may or may not have heard its name before, if you’ve ever gazed lovingly at the colourful array of fruits and vege’s at the market – you’ve been admiring the beauty of quercetin.

If you are one of the 2.5 million Australians who already eat a plant-based diet, you're likely to be already consuming a fair amount of quercetin every day without realising it.

Studies have revealed that quercetin is in fact the most common bioflavonoid in the human diet, making up as much as 75% of total flavonol intake1. The quality of fruits and vegetables you eat also influences the amount of dietary quercetin you receive, with one study revealing organically grown tomatoes have around 79% more quercetin than chemically grown fruit2.

Food sources of quercetin

Among so many fruits and vegetables, quercetin can be found in abundance in:

  • apples
  • grapes
  • onions
  • tea
  • nuts
  • berries
  • cauliflower
  • cabbage

The beauty of quercetin

Pronounced “Kwur-si-tin”, while it can be a mouthful to say, quercetin has piqued the interest of researchers for the potential role it plays in helping to stabilise mast cells. Mast cells are immune based cells that are present in all parts of the body and secrete different chemicals, including histamine, during the early stages of an allergic reaction. Too much histamine causes swelling in the nose and eyes as the body tries to stop allergens entering, a reaction some individuals experience coming into spring.

Apart from its beauty, quercetin is also well-known for its potent antioxidant effects, helping to reduce free radical damage to cells in an effort to keep them healthy.

The convenience of quercetin

Research recommends taking quercetin in divided doses, making it the most beneficial way to access the benefits of the flavonols3. Taking one tablet three times a day provides a therapeutic dose of quercetin over a spaced-out period of time, allowing the nutrient to be absorbed and metabolised in stages.

Herbs of Gold offer high-strength quercetin in a therapeutic, well-rounded formula, Quercetin Complex. This golden formula includes quercetin, supported by a combination of rutin and hesperidin not only for their potent antioxidant actions, but also for their ability to support healthy blood vessels and capillaries. Not forgotten has been the addition of vitamin C for its ability to support both the health and function of the immune system.

1. Chun, O. K., Chung S. J., & Song, W. O. (2007). Estimated dietary flavonoid intake and major food sources of U.S. adults. Journal of Nutrition, 137(1),1244–1252.
2. Mitchell, A. E., Hong, Y. J., Koh, E., Barrett, D. M., Bryant, D. E., Denison, R. F., & Kaffka, S. (2007). Ten-year comparison of the influence of organic and conventional crop management practices on the content of flavonoids in tomatoes. Journal of Agricultural Food Chemicals, 55(1),6154–6159. 
3. Batiha, G., Beshbishy, A., Mulla, Z., Ikram, M., El-Hack, M., Taha, A., Algammal, A., & Elewa, Y. (2020). The pharmacological activity, biochemical properties, and pharmacokinetics of the major natural polyphenolic flavonoid: quercetin, Foods 9,374.

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