Solgar Ester-C Plus 500mg Vitamin C - 50 Capsules. Ester-C provides immune support. Vitamin C protects cells against oxidative stress. Ester-C gets into the body fast and stays working. Trademarked and scientifically studied Ester-C vitamin C. Includes citrus bioflavonoids, rutin, acerola and rose hips. Unique patented formula, including bioflavonoids, acerola and rose hips.