What actually helps with frequent colds
Catching upper respiratory infections more often than average (more than 2-3 per year), suggesting suboptimal immune function.
Vitamin C supports immune function by enhancing neutrophil chemotaxis, phagocytosis, and reactive oxygen species generation. It also supports epithelial barrier function, increases natural killer cell activity, and modulates T-cell maturation.
Dose: 500–1000 mg
Vitamin D activates innate immune defenses by inducing cathelicidin and defensin antimicrobial peptides. It also enhances macrophage pathogen killing, modulates T-cell response, and reduces excessive inflammatory cytokine production.
Dose: 2000–4000 IU
Zinc is critical for both innate and adaptive immunity. It supports T-cell development, natural killer cell function, and neutrophil activity. Zinc ions also directly inhibit rhinovirus replication by blocking viral binding to ICAM-1 receptors.
Dose: 15–30 mg
NAC replenishes glutathione, the primary intracellular antioxidant in immune cells. It also thins mucus (mucolytic), reduces viral replication, and modulates NF-kB to optimize inflammatory response without immunosuppression.
Dose: 600–1200 mg
Selenoproteins enhance immune cell function and antibody production. Glutathione peroxidase reduces oxidative stress during infection.
Dose: 55–100 mcg
Exhibits antiviral properties against respiratory viruses, acts as zinc ionophore, modulates immune cell function.
Dose: 500–1000 mg
Anthocyanins stimulate cytokine production and inhibit viral neuraminidase, preventing viral entry into host cells.
Dose: 300–600 mg
Activates macrophages and increases white blood cell phagocytic activity, enhancing innate immune surveillance.
Dose: 300–500 mg
Allicin stimulates immune cell function and reduces cold incidence through antimicrobial and immunomodulatory effects.
Dose: 180–360 mg
Beta-glucan polysaccharides potentiate immune function and enhance NK cell activity against pathogens.
Dose: 1000–1500 mg