https://www.anti-aging-now.com/grapeseed-extract.html -Grape seeds have a high concentration of flavonoids and oligomeric proanthocyanidins, (OPC). These compounds also found in grape seed in lower concentrations in grape skin, and . Grape seed contains various lipids, including the omega-6 fatty acid linoleic acid and the omega-9 fatty acid oleic acid. Grape seed provides the essential amino acids leucine, phenylalanine and valine, and the non-essential amino acids arginine and cystine.

OPCs are found in grape juice and wine. OPC is why we have what is called the French Paradox in that people in France who drink a lot of red wine don’t tend to have a lot of heart problems. Even though they smoke and eat a lot of fatty foods.