Esterol Ester-C® – Vitamin C with BioflavonoidsEsterol Ester C Vitamin C with Bioflavonoids Advanced Immune Support with Buffered Vitamin C & Antioxidants Product Overview Esterol Ester C by Allergy Research Group is a patented form of vitamin C that combines ascorbic acid with calcium and citrus bioflavonoids for enhanced immune and antioxidant support. This unique formula includes quercetin, rutin, and grape seed extract (proanthocyanidins), known for their free radical fighting properties.*
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