Natures Plus Immune Support 60. NaturesPlus Immune Support is expertly formulated with the most effective ingredients to support the immune system.. Perfect for daily support, but can be increased during times of imbalance. Enjoy NaturesPlus Immune Support for your overall immune protection.. Vitamin A, Vitamin D, Vitamin C, Zinc and Copper contribute to normal function of the immune system. Zinc, vitamin C and copper contribute to the protection of cells from oxidative stress. KEY INGREDIENT: Provides 150mg of L-Cysteine