Hydrogen Peroxide

Benefits
DeodorantAntisepticLightening

What is Hydrogen Peroxide?

Hydrogen peroxide is a simple inorganic compound with the formula H2O2, consisting of water molecules with an added oxygen atom, typically available as a clear, colorless liquid solution stabilized for use. In cosmetics, it belongs to categories like antiseptics, bleaches, and oral care actives. It functions by slowly decomposing into water and nascent oxygen, which provides strong oxidizing power. This enables it to disrupt microbial cell walls for antimicrobial action, break down odor-causing compounds for deodorizing, oxidize pigments for lightening effects in skin or hair, and support oral hygiene by targeting bacteria and stains. Commonly found in spot treatments, mouthwashes, toothpastes, and hair colorants, its activity is concentration-dependent, requiring careful formulation to balance efficacy and stability.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 2-5 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Antimicrobial agent
Helps limit growth of bacteria and other microbes on skin or in the formula; may be used for product protection, odor control, or targeted antimicrobial effects.
Biocide
Destroys or inhibits harmful organisms to preserve products.
Oral care agent
Supports oral hygiene performance (cleaning, freshening, plaque control, sensitivity support) in toothpaste, mouthwash, and related products.
Oral health care drug
A regulated active used in oral products to treat or help prevent a specific condition (e.g., caries, gingivitis), subject to local OTC drug rules.
Oxidizing agent
Provides controlled oxidation for functions like hair bleaching/dye development or stain breakdown; must be balanced for stability and safety in the formula.

Benefits

Supports antimicrobial effects to help control microbes on skin.

Aids in deodorizing by neutralizing odor sources.

Promotes lightening through oxidation of pigments.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals seeking antiseptic properties in spot treatments.
People with sensitive or damaged skin.
People using oral care products for hygiene support.
Individuals prone to irritation from oxidants.
Those interested in lightening effects for skin or hair.
Those with allergies to peroxides.

Safety Notes

  • Rated 2-5 by EWG, indicating low to moderate hazard depending on use.
  • Can cause irritation at higher concentrations; patch test recommended.

Frequently Asked Questions about Hydrogen Peroxide

What does hydrogen peroxide do in skincare?

It provides antimicrobial, deodorizing, and lightening actions via oxidation.

Is hydrogen peroxide comedogenic?

It has a comedogenic rating of 0, unlikely to clog pores.

What are typical uses in products?

Found in antiseptics, oral care, and bleaching formulations.