Synergistic effect complex 14 active ingredients Immune system function1 Reduction of tiredness & fatigue2 1Vitamin D, B6, and Zinc contribute to the normal function of the immune system. 2Riboflavin and vitamin B6 contribute to the reduction of tiredness and fatigue. Vitamin D, B6, and Zinc contribute to the normal function of the immune system - With Echinacea purpurea, Turmeric, and Cranberry Guard Up! Your immune system is a complex network of cells, chemicals, and organs that defends th