According to The George Mateljan Foundation, “chard leaves contain at least 13 different polyphenol antioxidants, including kaempferol, the cardioprotective flavonoid that’s also found in broccoli, kale, strawberries, and other foods. But alongside of kaempferol, one of the primary flavonoids found in the leaves of chard is a flavonoid called syringic acid. Syringic acid has received…