Unique vitamin C support enhanced with bioflavonoids*. Immune and vascular support*. Easy to absorb form of vitamin C*. Made with hypoallergenic, vegan ingredients. Ester-C and flavonoids is a blend of vitamin C and various flavonoid compounds to provide enhanced vitamin C support. Ester-C and flavonoids helps maintain a healthy immune system as well as support to blood vessel integrity and healthy cell function.*.