Solgar Ester-C Pus Patented Vitamin C in effervescent sachets to help support the normal function of the immune system . Recharge your body and mind with Solgar Ester-C Pure Vitamin C 1000mg . It includes B vitamins, zinc, and magnesium to support energy release, immune and cognitive support, and electrolyte balance . These sachets provide 24-hour immune support thanks to Ester-C and help recharge the body and mind thanks to the B vitamins, zinc, and electrolytes they contain. Ester-C increases vitamin C levels in white blood cells, essential components of the immune system . Ester-C remains in the body longer than standard forms of vitamin C, and is therefore able to provide 24-hour immune system support. Plus, it has a natural orange flavor.