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Vitamin C enhanced with flavonoids for antioxidant, immune, and vascular support‡


Benefits & Features

  • Promotes healthy immune system function‡
  • Supports healthy vascular integrity‡
  • Easy-to-absorb, enhanced-retention form of vitamin C
  • Includes quercetin and rutin to synergistically complement vitamin C
  • Made with high-quality vegan ingredients backed by verifiable science



  • Ages 9 and up
  • Immune and vascular support‡

Suggested Use

As a dietary supplement, take 1 capsule, 1-2 times daily, with or between meals.

Science & Research

Verifiable Science

Ester-C® & flavonoids offers a blend of Ester-C® and flavonoid compounds to provide vitamin C support for healthy immune and cellular function as well as blood vessel integrity.1,2 Ester-C®, consisting primarily of calcium ascorbate, is a natural, non-acidic water-soluble form of vitamin C that is distinguished by its unique biological activity.3 In a double-blind, placebo-controlled, crossover trial, Ester-C supplementation resulted in significantly higher white blood cell vitamin C concentrations compared to standard ascorbic acid at 8 hours and remained elevated at 24 hours.4 The bioflavonoids quercetin and rutin are free radical scavengers that complement the roles of vitamin C. Quercetin helps maintain healthy mast cell function and moderate healthy leukotriene and prostaglandin metabolism.5 Preclinical data show that rutin supports blood vessel integrity and healthy cell function.6,7‡



Van Straten M, et al. Adv Ther. 2002 May-Jun;19(3):151-9.

Fernandes PR, et al. Arq Bras Cardiol. 2011 Jun;96(6):490-7.

Moyad MA et al. Adv Ther. 2008 Oct;25(10):995-1009.

Mitmesser SH et al. SpringerPlus. 2016 5:1161.

Nieman DC, et al. J Appl Physiol. 2007 Nov;103(5):1728-35.

Chua LS. J Ethnopharmacol. 2013; 150: 805–817.

Wang W, et al. Biomed Pharmacother. 2017 Feb;86:32-40.

Ester-C® & flavonoids

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