Ester-C Plus is exclusively formulated by Solgar and provides a patented method of supplementing pH neutral (non-acidic) Vitamin C. In addition, Ester-C Plus contains the Vitamin C metabolites that occur along with Vitamin C in nature. A special manufacturing process is employed to form a unique calcium ascorbate metabolite complex. Solgar Ester-C Plus offers the addition of providing acerola, citrus bioflavonoid complex, rutin and rose hips.