Ester-C plus is exclusively formulated by solgar and provides a patented, PH neutral (non acidic) vitamin C that is gentle on the stomach. The vitamin C metabolites in ester-C positively impact the uptake and retention of vitamin C in cells, providing additional benefits. Unique calcium ascorbate metabolite complex. Incorporates natural bioflavonoids and acerola berry along with rose hips fruit powder yielding beneficial antioxidant support and active immune system support. Suitable for vegetarians. †Ester-C® Vitamin C has been clinically studied to stay in your white blood cells for up to 24 hours, which is longer than regular Vitamin C. White blood cells are an important part of the immune system. *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.