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 well retained.**
Delivers advanced antioxidant support**
Non-acidic: gentle on the digestive tract**
Well-retained & maximum retention**No Artificial Color, Flavor or Sweetener, No Preservatives, No Sugar, No Milk, No Lactose, No Soy, No Gluten, No Wheat, No Yeast, No Fish, Sodium Free.