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.