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HP9 Guard Reviews and Complaints Vitamin C, or ascorbic acid, is a powerful antioxidant that supports immune function, enhances collagen formation, fights fatigue, strengthens epithelial barriers, supports white blood cell activity, and protects cells from oxidative stress. Elderberry extract, from Sambucus nigra, has antiviral properties that may help limit viral replication during seasonal outbreaks. Quercetin is a flavonol that stabilizes mast cells and reduces histamine release, contributing to anti-inflammatory action. Beta-glucan, derived from oat or yeast cell walls, engages pattern recognition receptors on macrophages, priming these cells and natural killer cells, which are key players in innate immunity.