VS C [Immune]. This immune supporting formula is a combination that Chinese herbalists would describe as a metal enhancing formula. These herbs create a favorable environment for microbial balance and overall health. Developed by Dr. Wenwei Xie, VS C is exclusive to Nature's Sunshine. It contains the following time honored botanicals: Dandelion root, Purslane herb, Indigo leaves and root, Thlaspi herb, Bupleurum root, Typhonium flagelliforme, Scute root, Cinnamon twig, Licorice root, and Ginseng root. VS C is also available in liquid form, with the components of its dried counterpart extracted and preserved in a glycerin base.