Solgar Quercetin Complex with Ester-C Plus and Bromelain is a unique formula that supports immunity and provides strong protection against oxidative stress. It utilizes a patented, stomach-friendly, non-acidic form of Vitamin C, Ester-C Plus. Quercetin is a non-citrus bioflavonoid that works in synergy with Vitamin C. Bioflavonoids are naturally present in fruit, vegetables, and herbs, and are a class of powerful phytochemicals. This product is suitable for vegetarians, vegans, and is gluten-free, dairy-free, and Kosher. As a food supplement for adults, take two Vegicaps daily, preferably at mealtime, or as directed by a healthcare practitioner.