From the Manufacturer's Label:
Unique Gentle Form of Vitamin C
Non-acidic Ester-C® is a breakthrough patented formula that contains naturally-occurring Vitamin C metabolites and is quickly absorbed.**
Delivers advanced antioxidant support**
Non-acidic: gentle on the digestive tract**
Well-Retained & maximum retention**No Gluten, No Yeast, No Wheat, No Milk or Milk Derivatives, No Lactose, No Soy, No Egg, No Artificial Color, No Artificial Flavor.