Ester-C, the patented form of Vitamin C, provides 24-hour immune support, is non-acidic, and contains naturally-occurring metabolites for quick absorption.* And, since it is supported by science, you know you are giving your body the advanced immune support it shouldn"t be without.*Powerful immune support*- A recent clinical study shows that Ester-C increases vitamin C levels in your body for up to 24 hours.* Now that"s powerful immune support you shouldn"t be without! Naturally-occurring metabolites for quick absorption *- The metabolites in Ester-C activate the vitamin C molecules making it easier for them to be absorbed by the body. Ester-C is quickly absorbed and provides advanced immune support.* Gentle On Your Stomach* - Ester-C is non-acidic, making it gentle on your digestive system. So now, even people with sensitive stomachs can take advantage of the powerful, extended support of Ester-C.