Ester-C Plus 500mg by Solgar. Product 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. 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 powder yielding beneficial antioxidant support and active immune system support. Suggested Use As a dietary supplement adults take one (1) to three (3) vegetable capsules daily preferably at mealtime - Or as directed by your healthcare professional. Supplement Facts Serving Size 1 Vegetable Capsule. Per Serving Daily Value Vitamin C (as Ester-C calcium ascorbate) 500 mg 833 Calcium.