Blackmores Sustained Release C is a sustained release formula to gradually supply vitamin C throughout the day. Blackmores Sustained Release C gradually supplies vitamin C throughout the day to reduce the severity and duration of common cold symptoms Blackmores Sustained Release C has been specifically formulated to be released slowly over a sustained 8 hour period, ensuring that vitamin C is available when your body needs it.Our formulation is buffered with mineral ascorbates, making it gentle on the stomach compared to ascorbic acid alone. Size: 200 tablets KEY FEATURES A gradual release of vitamin C over 8 hours