Why are you not supposed to use hydrogen peroxide?

Why You Should Think Twice Before Using Hydrogen Peroxide

For decades, hydrogen peroxide has sat in medicine cabinets across the country, pulled out at the first sign of a cut or scrape. It fizzes, it foams, and it feels like it’s “working.” But that dramatic reaction might be more about perception than protection—and there’s growing reason to question its everyday use.

The truth is, hydrogen peroxide is a powerful oxidizer. At concentrations higher than 10%, it's corrosive—capable of damaging skin, eyes, and mucous membranes. Even the common 3% solution found in drugstores can irritate, especially on open wounds or sensitive skin. While it kills bacteria, it doesn’t discriminate: it also destroys healthy cells crucial for healing.

There are better alternatives. Simple soap and water are often enough to clean minor injuries. For disinfection, products with ingredients like iodine or alcohol (used sparingly) are generally safer and more targeted. And when in doubt, covering a wound with a sterile bandage and keeping it clean is usually the best move.

Hydrogen peroxide isn’t useless—it has valid uses as a surface disinfectant or for short-term oral rinses in very diluted forms—but its role in first aid has been largely outdated. Our understanding of skin health and healing has evolved, and so should our habits.

The next time you reach for that brown bottle, pause. That familiar fizz might look impressive, but real healing often starts with gentler choices.