Should You Put Hydrogen Peroxide in Your Nose to Prevent Illness? Let’s Talk 🤔🚨 There’s a claim that putting hydrogen peroxide in your nose can prevent colds and the flu. But here’s the reality—there’s zero solid evidence to support this, and it may do more harm than good. Hydrogen peroxide is a strong oxidizing agent, meaning it can irritate and damage nasal tissues, disrupting the natural defenses your nose already has. Your nasal passages are lined with mucus and cilia that trap and clear o