Immunity
Immunity is the body's own system for responding to everyday environmental exposure, and vitamin C, vitamin D, zinc and quercetin are nutrients commonly used in dietary supplements in this category.
Updated Sep 2026
VISTRA's approach to immunity is nutrition-first: the ingredients and formulas on this page are made to fit a balanced daily routine — alongside a varied diet, enough sleep and regular activity, not to replace them. Every product here is listed with the ingredient information exactly as it appears on that product's label. Dietary supplements are not intended to prevent, treat or cure any disease.
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