Citrus fruits are product of trees and shrubs from family of plants, Rutaceae, including orange, lemon, lime, grapefruit, mandarin, and pomelo.
They are good sources of nutrients, particularly of vitamin C. In addition to vitamin C, which is the most abundant nutrient, these fruits are a source of B vitamins (thiamin, pyridoxine, niacin, riboflavin, pantothenic acid, and folate). Furthermore, citrus fruits are abundant in macronutrients - sugars, dietary fiber, potassium, folate, calcium, phosphorus, magnesium, copper, riboflavin and pantothenic acid.
Citrus fruits contain a number of secondary metabolites, such as flavonoids, alkaloids, coumarins, limonoids, carotenoids, phenol acids and essential oils. These biochemicals play a vital role in human health and show important activity in human body, including anti-oxidative, anti-inflammatory, anti-cancer, as well as cardiovascular protective effect. Studies of bioactivity of flavonoids have been extensively reported in last 50 years.
Citrus fruits have been used in traditional and modern medicine and nutrition as a source of very important biochemicals supporting human health, particularly cardiovascular health, with its strong anti-oxidant activity, vascular protective effect, and its vascular function improvement effect.
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