Emergen-C Immune+ supports your immune system with the key nutrients your body needs, plus Vitamin D and Zinc*. Even more, every Emergen-C Immune+ support formula is packed with Vitamin C.*. Product Benefits. Vitamin D-Recent research suggests vitamin D plays an important role in regulating immune system function. Antioxidants-Vitamin C, zinc, and manganese are essential nutrients for maintaining a healthy antioxidant response. Proprietary Complex-Unique blend includes naturally sourced Wellmune WGP beta-glucans and arabinogalactans.