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Proanthocyanidins are a class of polyphenols found in many plants, such as cranberry, blueberry, and grape seeds. Chemically, they are oligomeric flavonoids. Many are oligomers of catechin and epicatechin and their gallic acid esters. More complex polyphenols, having the same polymeric building block, form the group of condensed tannins.
A 2016 meta-analysis concluded that grape seed extract, in a dose of under 800 milligrams per day over at least 8 weeks, might help to reduce systolic and diastolic blood pressure. [7] People with metabolic syndrome had a more significant outcome (average of a 8½ mmHg decrease in systolic blood pressure) than in healthy subjects. [7]
The term polyphenol is not well-defined, but it is generally agreed that they are natural products with "several hydroxyl groups on aromatic rings" including four principal classes: "phenolic acids, flavonoids, stilbenes, and lignans". [5] Flavonoids include flavones, flavonols, flavanols, flavanones, isoflavones, proanthocyanidins, and ...
Anthocyanin extracts are not specifically listed among approved color additives for foods in the United States; however, grape juice, red grape skin and many fruit and vegetable juices, which are approved for use as colorants, are rich in naturally occurring anthocyanins. [46]
Furthermore, flavonoids can be found in plants in glycoside-bound and free aglycone forms. The glycoside-bound form is the most common flavone and flavonol form consumed in the diet. [1] A biochemical diagram showing the class of flavonoids and their source in nature through various inter-related plant species.
Grape therapy or grape diet, also known as ampelotherapy, is a diet that involves heavy consumption of grapes, including seeds, and parts of the vine, including leaves, that is a form of alternative medicine. The concept was developed in 19th-century Germany in spas such as Bad Duerkheim and Merano. [1]
Flavonoids, a type of phytochemical found in pomegranates, have free-radical fighting antioxidant effects that may aid in the prevention of skin cancer, prostate cancer and colon cancer, Gentile says.
Grapefruit seed extract (GSE), also known as citrus seed extract, is a liquid extract derived from the seeds, pulp, and white membranes of grapefruit. [1] GSE is prepared by grinding the grapefruit seed and juiceless pulp, then mixing with glycerin . [ 1 ]