Ester-C® Plus is exclusively formulated by Solgar® and provides a unique, pH neutral (non acidic) Ester-C® Vitamin C that is gentle on the stomach. The Vitamin C metabolites in Ester-C® positively impact the retention of Vitamin C in cells, providing additional benefits.* A special manufacturing process is employed to form a unique calcium ascorbate metabolite complex. This well-retained complex further incorporates natural bioflavonoids and acerola berry along with rose hips fruit.