Since 1947 Well-Retained Gentle & Non Acidic Immune Support Non-GMO Halal Gluten Wheat & Dairy Free Suitable for Vegans Certified Gluten-Free K-Parve Dietary Supplement 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.