Ester-C® & flavonoids

Only %1 left
ECF21/ ECF29
Vitamin C enhanced with flavonoids for antioxidant, immune and vascular support
Starting From $26.40



Retail Price

ECF21/ ECF29


Pure Encapsulations® products are formulated using high-quality, pure ingredients, FREE FROM unnecessary additives and many common allergens including:

Wheat, Soy, Dairy, Eggs
Artificial Colors & Sweeteners
Coatings & Shellacs
Tree Nuts, Peanuts & Sesame
Unnecessary Binders, Fillers & Preservatives
Magnesium Stearate
Trans Fat & Hydrogenated Oils

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‡


  1. Van Straten M, et al. Adv Ther. 2002 May-Jun;19(3):151-9.
  2. Fernandes PR, et al. Arq Bras Cardiol. 2011 Jun;96(6):490-7.
  3. Moyad MA et al. Adv Ther. 2008 Oct;25(10):995-1009.
  4. Mitmesser SH et al. SpringerPlus. 2016 5:1161.
  5. Nieman DC, et al. J Appl Physiol. 2007 Nov;103(5):1728-35.
  6. Chua LS. J Ethnopharmacol. 2013; 150: 805–817.
  7. Wang W, et al. Biomed Pharmacother. 2017 Feb;86:32-40.

Additional Information


If you are pregnant or lactating, have any health condition or are taking any medication, consult your health professional before use.


Store in a cool, dry place.


  • Ester-C® is manufactured in a proprietary process from ascorbic acid sourced from corn dextrose fermentation, and U.S. mined elemental minerals
  • Quercetin is derived from Fava d'anta tree (Dimorphandra mollis) or Japanese pagoda tree (Sophora Japonica) flower buds
  • Rutin is derived from Japanese pagoda tree (Sophora Japonica)

Free From

GICO.ORG Certified Gluten-Free by the Gluten-Free
Certification Organization,
GMO Free Vegan Vegetarian