High Potency Superior Antioxidant Alpha-Mangostin, Flavonoids & Tannins Herbal Supplement BPA-Free Bottle Triple-Standardized Made exclusively from the xanthone-rich rind of the fruit, this proprietary blend of Mangosteen extracts is an in-vitro antioxidant and supplies all of the nutrients and none of the sugar of juice products. This advanced formula provides you with high levels of the beneficial compounds Alpha-mangostin, flavonoids and tannins. Like all Savesta products, third-party tested for potency and purity. This triple-standardized extract of Mangosteen rind contains over 50 xanthones and offers a higher level of nutrients and none of the sugar of juice products.