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Quest Vitamins LTD,
8 Venture Way,
Aston Science Park,
B7 4AP.

Tel: 0121 359 0056
Fax: 0121 359 0313
Registered in England No. 2530437



Bioflavonoids are a large group of plant pigments found in food. Bioflavonoids (e.g. Quercetin, hesperidin, rutin) are found closely associated with Vitamin C in nature: for example in oranges, vitamin C is present mainly in the juice, whilst bioflavonoids are concentrated in the pith.


Bioflavonoids and Carotenoids provide the variation of colours in fruit and vegetables. Chlorophyll provides the green which is the central component of a plant?s energy system, but bioflavonoids contribute blues, purples, emerald green and some reds; carotenoids provide the yellows, orange and reds. They are concentrated in the skins and seeds. The flavonoids? function is to screen plant cells from the damaging effects of sunlight.

Bioflavonoids have been shown to increase the uptake of vitamin C: in one study, uptake of vitamin C was 35% higher from a citrus extract than from vitamin C alone (1).

Bioflavonoids are important for strengthening the capillaries (small peripheral blood vessels) and may be a useful supplement in people with circulation problems or who Bruise easily. Bioflavonoids have also been shown to be mildly anti-inflammatory, and to have an anti-histamine effect (2).

Bioflavonoids may also help to reduce the risk of heart disease and be of benefit to those with Haemorrhoids, allergies, Asthma and menopausal symptoms (2).


Bioflavonoids are safe, with no known toxic side effects.


There are no reported drug interactions or contra-indications for bioflavonoids.


1. Am J Clin Nutrition, 1988,48:601-604.
2. "Handbook of Dietary Supplements", Pamela Mason, Blackwell Science, 1995.

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