Ester-C® is a researched form of Vitamin C that may support natural immunity. Ester-C® may lead to a more sustained retention of Vitamin C in the white blood cells than ascorbic acid (in non-smokers). It is a non-acidic form of Vitamin C and may be better tolerated than standard Vitamin C in people who are sensitive to acidic foods.Taken when required, Nutra-Life Ester-C® + 500 may: Provide 24 hour immune support Aid in decreasing the duration of colds when taken regularly Provide antioxidant support Ingredients Ingredient Per 1 tab Total Ascorbic acid (Vitamin C) 500 mg Calcium ascorbate dihydrate (Vitamin C) (Ester-C®) 319 mg equiv. Ascorbic acid (Vitamin C) 250 mg Calcium L-threonate 4.02 mg equiv. Calcium .53 mg Calcium carbonate 3.66 mg Sodium ascorbate (Vitamin C) 284 mg equiv. Ascorbic acid (Vitamin C) 250 mg Formulated without: Gluten, wheat, animal products, egg, soy, artificial colours, artificial flavours or artificial sweeteners. Suitable for vegetarians.Contains: Sugars, sodium salts & sulfites. Directions for Use Adults and children over 12 years: Chew 1-2 tablets 3 times daily with food or as directed by your healthcare professional. Warnings Vitamin supplements should not replace a balanced diet.Not to be used in children under 2 years of age without consulting your healthcare practitioner.Always read the label. Use only as directed.If symptoms persist, consult your health professional.