The onion is composed mainly of water (89%). Regarding vitamins and minerals, it contains vitamin C, potassium, calcium and phosphorus, as well as a high percentage of chromium and small amounts of sulfur, bromine, cobalt, copper, magnesium, silicon and zinc. It also contains phytochemicals (highlights the flavonoid quercetin). This antioxidant, more powerful than vitamin E, has anti-inflammatory, anti-allergic and protective properties against cancer (breast, colon and prostate), in addition, it helps to reduce symptoms of fatigue, anxiety and depression. Among the main properties of purple onion is its It contains glucokinin, a substance considered "vegetable insulin", which helps fight diabetes. Its sulfur content has a cleansing effect and its essential oil has bactericidal and fungicidal properties.
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