Pectin is available as an extract and powder at most grocery and health food stores. Also, keep in mind that all fruits are made up of at least 5 percent to 10 percent pectin. Nutrition-packed apples, peaches, oranges, blackberries, grapes, grapefruit and apricots contain the highest amount of pectin among fruits. Carrots, tomatoes, potatoes and peas are also high in pectin.