Finings - Nutritional and Vegetarian Concerns

Nutritional and Vegetarian Concerns

Unfortunately, healthful antioxidant flavonoids are removed by some finings. Quercetin is removed from red wines via the finings gelatin, casein, and PVPP to reduce astringent flavors. If other fining methods are used, the quercetin remains in the wine. Similarly the catechin flavonoids are removed by PVPP and other finings that target polyphenolic compounds.

In the absence of "animal products used here" labels, vegetarians may be unaware that the processing of a commercially produced beverage may have utilized animal based finings: either gelatin, casein, albumen, or isinglass.