Ester C (R) is a buffered form of vitamin C with metabolites.  This Vitamin C form is well tolerated by people whom normally came tolerate Vitamin C due to it's acidity.  Metabolites are created by the body from the nutrients you eat.
Research shows this form is well absorbed and retained in the cells and tissues. This product isfurther enhanced by  a synergistic blend of Bioflavonoids, Acerola, Rose hips, and Rutin.
Ingredients:  1 capsule contains: Vitamin C (from Ester C (R) Calcium Ascorbate)500 mg., Calcium (from Ester C(R) Calcium Ascorbate) 57 mg., Citrus Bioflavonoids (37% total bioflavonids as Hesperidin) 200 mg., Acerola Powder (Malpighia glabra) fruit 75 mg, Rose Hips Powder (Rose pseudofructus) fruit 75 mg, Rutin 50 mg.
Contains nosugar, yeast, wheat, gluten, egg or soy. 
The recommended adultmaintenance dose:  1 capsule twice daily. 
Safe for the elderly, children, and pets.