It offers a gentler, more easily digested form of vitamin C which is pH neutral and non-acidic. The metabolites of Ester-C® have a positive effect on the levels of vitamin C retention in the body’s immune cells, giving you superior immune support. Solgar’s Ester-C® is an exclusive formulation with additional natural plant bioflavonoids, powerful antioxidants that naturally accompany Vitamin C in fruits and vegetables.