On Guard Chewable TabletsA strong immune system is more important than ever and doTERRA On Guard Chewable Tablets are formulated to help maintain healthy immune system function and provide your body needed support when taken internally. Description These tablets contain the proprietary doTERRA On Guard Protective Blend, vitamin C, vitamin D, Zinc and powerful beta glucan. Significant studies over several decades show that beta glucan, a natural prebiotic fiber, helps your