PEROXIDE

📋 Quick facts

Description: PEROXIDE — PEROXIDE. Formula: H2O2. MW: 34.015. IUPAC: hydrogen peroxide.

Quick Facts:

• Category: other

Proven Benefits At A Glance:

• Benzoyl peroxide is an FDA-approved over-the-counter acne treatment that kills acne-causing bacteria
• Only about 5% of topical benzoyl peroxide is absorbed into the body, making it low-risk for breastfeeding
• Hydrogen peroxide (a different peroxide) is used in household products at 3-9% concentration, but concentrated forms are toxic
• Hydrogen peroxide works as a disinfectant by creating free radicals that damage bacteria—but can also damage your own cells

⚗️ Chemical Overview

Hydrogen peroxide is a colorless liquid at room temperature with a bitter taste. Small amounts of gaseous hydrogen peroxide occur naturally in the air. Hydrogen peroxide is unstable, decomposing readily to oxygen and water with release of heat. Although nonflammable, it is a powerful oxidizing agent that can cause spontaneous combustion when it comes in contact with organic material. Hydrogen peroxide is found in many households at low concentrations (3-9%) for medicinal applications and as a clothes and hair bleach. In industry, hydrogen peroxide in higher concentrations is used as a bleach for textiles and paper, as a component of rocket fuels, and for producing foam rubber and organic chemicals. Hydrogen peroxide, aqueous solution, stabilized, with more than 60% hydrogen peroxide appears as a colorless liquid. Vapors may irritate the eyes and mucous membranes. Under prolonged exposure to fire or heat containers may violently rupture due to decomposition. Used to bleach textiles and wood pulp, in chemical manufacturing and food processing. Hydrogen peroxide, aqueous solution, with not less than 20% but not more than 60% hydrogen peroxide (stabilized as necessary) appears as colorless aqueous solution. Vapors may irritate the eyes and mucous membranes. Contact with most common metals and their compounds may cause violent decomposition, especially in the higher concentrations. Contact with combustible materials may result in spontaneous ignition. Prolonged exposure to fire or heat may cause decomposition and rupturing of the container. Used to bleach textiles and wood pulp, in chemical manufacturing and food processing.

Source(s): Agency for Toxic Substances and Disease Registry (ATSDR), CAMEO Chemicals, via PubChem

📊 Comedogenicity

🛡️ Safety rating

Safety tier is a starting heuristic from regulatory status and comedogenic rating, not a dermatological verdict — see our Terms for the full disclaimer. Research confidence reflects how many real cited studies back this ingredient, not the strength of their findings.

🌍 Regulatory Status

💧 Skin Type Compatibility

⚠️ Don’t Combine With

📚 Research & Evidence

🔬 The Science

When discussing ‘peroxide’ in skincare, it’s important to distinguish between benzoyl peroxide and hydrogen peroxide, as they have different safety profiles and uses. #1: Benzoyl peroxide is a topical acne medication approved by the FDA specifically for acne vulgaris (the most common form of acne). It works through bactericidal properties, meaning it kills the bacterium Cutibacterium acnes that lives in skin and hair follicles (J Invest Dermatol, 2023). #2: Topical benzoyl peroxide has minimal systemic absorption—only about 5% enters the bloodstream following application to skin, which is why it’s considered low-risk even during breastfeeding, though direct infant contact with treated areas should be avoided (2006 peer-reviewed journal).

For breastfeeding safety specifically, only water-based cream or gel formulations should be used on breast tissue, since ointment bases may expose an infant to high mineral oil levels through direct contact. Hydrogen peroxide is a chemically different compound with distinct uses and risks. #3: Hydrogen peroxide naturally occurs in your body as a byproduct of normal cellular respiration and is commonly found in household products (3-9% concentration) for disinfection, wound cleaning, and hair bleaching (2026 peer-reviewed journal, Toxicol Rev 2004). #4: As a disinfectant, hydrogen peroxide rapidly oxidizes and creates free radicals that damage proteins, DNA, and cell membranes in both bacteria and human tissue (2026 peer-reviewed journal).

#5: Concentrated hydrogen peroxide (over 35%) is caustic and can cause severe tissue damage, and ingestion can generate dangerous oxygen gas bubbles in the bloodstream leading to gas embolism, respiratory failure, and potentially death (Toxicol Rev 2004). Even dilute solutions (3%) can cause stinging and irritation if applied to eyes, while solutions over 10% risk corneal damage (Toxicol Rev 2004). The sources note that ‘hyperoxygenation therapy’ products marketed for serious illnesses like cancer are not supported by research and have caused harm (2026 peer-reviewed journal).

📄 Related Research

Matched by search — not necessarily verified support for every statement above.

• Unknown authors (2006). Benzoyl Peroxide. a peer-reviewed journal.
• Matin T et al. (2026). Benzoyl Peroxide. a peer-reviewed journal.
• Watt BE et al. (2004). Hydrogen peroxide poisoning. Toxicol Rev.
• Minzaghi D et al. (2023). Excessive Production of Hydrogen Peroxide in Mitochondria Contributes to Atopic Dermatitis. J Invest Dermatol.
• Nelson AL et al. (2026). Hydrogen Peroxide Toxicity. a peer-reviewed journal.

🧴 Products Containing PEROXIDE

• CONAXESS TRADE NORGE AS Brillance Hårfarge 872 Intense Red
• Santé Verte Nature & care permanent colour chocolate
• Delia, Delia Cosmetics Cameleo Blond Moyen 7.0
• Numan Testosterone support
• L’OREAL NORGE AS Preferance 1 Napoli
• L’OREAL NORGE AS Preferance 4.15 Caracas
• L’OREAL NORGE AS Excellence 10 Ekstra Lys Blond
• L’OREAL NORGE AS Excellence 5.5 Lys Mahognibrun
• Charlotte Tilbury magic eye
• L’OREAL NORGE AS Excellence 6 MørkeBlond
• Ryana, Verona Precious argan oil Cerise noir
• Venita Perfect Intensive Color Creme 180 Cyclamen
• CONAXESS TRADE NORGE AS Live Urban Metallics U69 Amethyst Chrome
• CONAXESS TRADE NORGE AS Brillance Hårfarge 924 Choco Couture
• CONAXESS TRADE NORGE AS Live Urban Metallics U67 Blue Mercury
• CONAXESS TRADE NORGE AS Live Urban Metallics U72 Dusty Silver
• CONAXESS TRADE NORGE AS Blonde Blondering Highlights M1
• CONAXESS TRADE NORGE AS Blonde Blondering Ultra Lightener L1+
• L’OREAL NORGE AS Excellence 9 Meget Lys Blond
• 3 chênes, 3 chênes Beauty belleza oleo-proteique complex color & soin 6 G blond foncé doré
• Belifor Coloration Douss Color 134 Marron Chocolat – 131ML – Beliflor
• Henkel, Schwarzkopf Palette Salon Colors 8.5
• l-oreal Casting crème gloos
• L’OREAL NORGE AS Casting Creme Gloss 415 Marron Glace
• L’OREAL NORGE AS Casting Creme Gloss 535 Chocolat
• L’OREAL NORGE AS Casting Creme Gloss 323 Choc Noir
• L’OREAL NORGE AS Excellence 8.3 Lys Gyldenblond
• Clairol Nice ‘n Easy Root Touch-Up Permanent Hair Color, 4R Dark Auburn
• L’OREAL NORGE AS Casting Creme Gloss 412 Beigebrun
• L’Oréal, L’Oreal Consumer products, L’Oréal Paris PRODIGY 6.0 LIN Blond foncé
• Lavoris Whitening Mouthwash
• Henkel, Schwarzkopf Natural & Easy 545 blond cendré
• L’OREAL NORGE AS Excellence 4.3 Golden Brown
• L’OREAL NORGE AS Excellence Creme Ultra 3.11 Ash Dark Brown
• L’OREAL NORGE AS Excellence Creme Ultra 4.11 Ash Brown
• O7 Active Mondspoeling
• eco dent
• Kraze Crème colorante pour les cheveux 004 – Light brown
• Arm & Hammer Toothpaste
• colgate optic white