Personal Care — General

1,4-Dioxane is an unintentional manufacturing contaminant generated during the ethoxylation process used to make surfactants in foaming cleaning products and shampoos. It is not an added ingredient and will not appear…

Aerosol body sprays, deodorants, and dry shampoos use liquefied petroleum gas (LPG) propellants — primarily butane, isobutane, and propane — to deliver product as a fine mist. These hydrocarbon gases are highly concen…

Aluminium salts are the active ingredient in antiperspirants — they work by physically blocking sweat glands. Concerns centre on systemic absorption through underarm skin, particularly where skin is damaged by shaving…

Aluminium salts are the active ingredients in antiperspirant products — they work by forming a temporary gel plug in sweat ducts to reduce perspiration. They are applied daily to axillary skin, often to recently shave…

Azo dyes are the largest class of synthetic colourants used in textile manufacture — they account for more than 60% of all dyes used in clothing, producing the full spectrum of reds, oranges, yellows, browns, and some…

Butylated hydroxyanisole (BHA, E320) and butylated hydroxytoluene (BHT, E321) are synthetic phenolic antioxidants added to fats, oils, and fat-containing foods to prevent rancidity. BHA is classified as a possible hum…

Bisphenol S (BPS) was adopted as the primary replacement for bisphenol A (BPA) in polycarbonate plastics and epoxy resins following the regulatory and consumer backlash against BPA. Products carrying "BPA-free" labels…

Bisphenol A (BPA) has been used as a colour developer coating on thermal paper since the 1960s — the same BPA that concerns toxicologists in plastics is present in very high concentrations (up to 3% by weight) on the …

Holiday sunscreen use is quantitatively different from everyday SPF application — a beachgoing family may apply sunscreen to children multiple times per day for two weeks, to large body surface areas including skin th…

Chemical UV filters in sunscreens are organic compounds that absorb ultraviolet radiation and convert it to heat. They are distinct from mineral UV filters (zinc oxide and titanium dioxide) which physically scatter UV…

Chlorhexidine is a broad-spectrum antiseptic used in prescription and over-the-counter mouthwashes. While effective against oral pathogens, it indiscriminately destroys the beneficial oral bacteria responsible for con…

Chlorhexidine is a biguanide antiseptic that has been used in dental mouthwashes for decades and is considered the gold-standard anti-plaque agent by dentistry. It is extraordinarily effective at killing oral bacteria…

D4 (cyclotetrasiloxane) and D5 (cyclopentasiloxane) are silicone-based compounds used to give personal care products their characteristic silky, smooth feel. Both are persistent environmental pollutants — D4 is classi…

D-Limonene is a naturally occurring terpene derived from citrus peel, widely used in "natural" and "eco" cleaning products as a solvent, fragrance, and degreaser. Despite its natural origin and pleasant smell, it is a…

DEET (N,N-diethyl-meta-toluamide) is the most widely used and most effective insect repellent available for consumer use — it is the recommended active ingredient for malaria and dengue prevention in tropical travel d…

Diethanolamine (DEA) is a viscous liquid used as a pH adjuster, emulsifier, and foam booster in liquid cleaning products and personal care items. DEA itself has low acute toxicity, but reacts with nitrite-containing p…

Disperse dyes are a class of water-insoluble dyes designed for dyeing hydrophobic synthetic fibres including polyester, nylon, acetate, and triacetate. They are suspended rather than dissolved in the dye bath and are …

Disperse dyes are the colourants used to dye synthetic fibres including polyester, nylon, acetate, and spandex/elastane — they are called "disperse" because they are only sparingly soluble and must be applied as a fin…

Ethanolamines — primarily monoethanolamine (MEA), diethanolamine (DEA), and triethanolamine (TEA) — are a family of alkanolamines used as pH adjusters, emulsifiers, and surfactant components across a wide range of hou…

Formaldehyde is an IARC Group 1 confirmed human carcinogen present in many environments — from flat-pack furniture off-gassing to keratin hair straightening treatments. In personal care products it appears directly or…

Men's grooming products — aftershave, cologne, shaving gel, hair gel, and body spray — typically carry higher fragrance loads than equivalent women's personal care products, yet fragrance allergen awareness in male co…

Galaxolide is a polycyclic synthetic musk — one of the most widely used fragrance compounds in the world. It has documented estrogenic activity, bioaccumulates in human tissue, and has been detected in breast milk and…

Hair styling products — gel, wax, pomade, clay, putty, paste, and hairspray — are applied directly to the scalp and hair and typically left on throughout the day, making them leave-on products with prolonged skin cont…

HEMA is a monomer used in gel, acrylic, and shellac nail products to bond the coating to the nail. Repeated skin contact causes progressive sensitisation — once sensitised, the immune response is lifelong and can be t…

Tourist souvenirs — cheap jewellery, painted ceramics, coloured glassware, toys, and decorative items sold at holiday destinations — are a well-documented source of heavy metal exposure, particularly in children. Regu…

Methylisothiazolinone (MIT) and its chlorinated analogue methylchloroisothiazolinone (CMIT) are synthetic biocide preservatives that became ubiquitous in cleaning products, cosmetics, and wet wipes during the 2000s an…

Nickel is the most common cause of allergic contact dermatitis worldwide — affecting approximately 8–14% of women and 1–2% of men in developed countries. Electronic devices, smartphones, smartwatches, fitness trackers…

Optical brightening agents (OBAs), also called fluorescent whitening agents (FWAs), are synthetic compounds added to white and light-coloured textiles, laundry detergents, and paper to make them appear whiter and brig…

Oxybenzone is one of the most common UV-absorbing chemicals in chemical sunscreens. It is absorbed through the skin into the bloodstream — confirmed by FDA research — and has demonstrated estrogenic activity. It is al…

p-Phenylenediamine (PPD) is the primary oxidative coupler in permanent hair dye — the chemical that enables permanent colour to penetrate and bond within the hair shaft. It is simultaneously one of the most potent and…

Parabens are synthetic preservatives that extend the shelf life of personal care products. Cheap, effective, and ubiquitous — found in the majority of shampoos, moisturisers, cosmetics, and pharmaceutical products. Th…

Phthalates are a family of plasticisers and fragrance fixatives found in an enormous range of products — from PVC flooring to nail varnish to the fragrance in shampoo. They are among the most extensively studied endoc…

Yoga mats, exercise mats, foam rollers, resistance bands, gym flooring, and many gym accessories are made from PVC or other synthetic rubber materials requiring plasticisers. The intimate skin contact during yoga, flo…

Polyurethane (PU) and PVC-coated faux leather — the synthetic leather used in "vegan leather" jackets, handbags, shoes, and clothing accessories — is plasticised with phthalates to achieve its characteristic flexible,…

Quaternary ammonium compounds (QACs or "quats") are a large family of synthetic antimicrobial chemicals used as disinfectants, preservatives, and surfactants. They are found in kitchen sprays, bathroom disinfectants, …

Resorcinol is an oxidative coupler used alongside PPD and other diamines in permanent hair dye formulations to create warm, brown, and auburn tones. It is a skin sensitiser, a thyroid hormone disruptor, and a reproduc…

SLS and SLES are the most widely used foaming surfactants in personal care products. SLS directly disrupts the skin barrier. SLES is milder but carries a separate concern: it can be contaminated with 1,4-dioxane — a p…

Sodium lauryl sulphate (SLS) is the most widely used synthetic surfactant in foaming consumer products — dish soaps, washing-up liquids, laundry detergents, shampoos, and toothpastes. It is an anionic surfactant that …

The ingredient declaration "fragrance" or "parfum" is a legally protected trade secret that can conceal up to several hundred individual chemicals under a single listing. The EU requires disclosure of 26 known allerge…

Synthetic musks are the most widely used fragrance base notes in aftershaves, colognes, body washes, and deodorants — they provide the long-lasting, warm, skin-close scent that defines most masculine fragrance product…

Synthetic musks are a diverse group of fragrance chemicals used to impart a lasting musky scent to fabric softeners, laundry detergents, cleaning products, and personal care items. The older nitromusk class (including…

Tattoo inks are injected directly into the dermis — a permanent deposition of chemical compounds bypassing all the body's normal barrier defences. Yet tattoo inks are among the least regulated cosmetic or personal car…

Tattoo inks are injected directly into the dermis — bypassing all the skin barrier defences that limit exposure from topical products — and remain there permanently, making them the most bioavailable route for cosmeti…

Thiurams and carbamates are chemical accelerants used in the vulcanisation of natural and synthetic rubber — they are essential to the manufacturing process that gives rubber its elasticity and durability. They are pr…

Titanium dioxide (TiO₂) is one of the most widely used white pigments in the world, present in paints, plastics, cosmetics, and food. As E171 in food, it provides whiteness and opacity in confectionery, chewing gum, b…

Triclosan is a broad-spectrum antimicrobial agent once ubiquitous in soaps, toothpastes and kitchen products. It was banned from rinse-off products in the US in 2016 and from most EU cosmetics in 2014, but remains in …