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 household cleaning products. MEA in particular is found in oven cleaners, heavy-duty degreasers, and laundry stain removers at significant concentrations. The class is associated with skin and respiratory sensitisation, thyroid disruption, and the formation of nitrosamines when combined with nitrite-releasing preservatives.
Where it's found
Heavy-duty oven cleaners and degreasers use monoethanolamine (MEA) as an alkaline cleaning agent — often at concentrations of 5–15%. Laundry stain removers and pre-treatment sprays. Floor cleaners and stripping solutions. Glass cleaners. Dishwasher rinse aids in some formulations. MEA is also used in paint strippers and some DIY products. Triethanolamine (TEA) is widely used in cosmetics, skin creams, and personal care products as a pH adjuster. The Dow Chemical Company's MEA-based cleaners are representative of heavy-duty household use.
Routes of exposure
Skin contact during use of oven cleaners and heavy-duty degreasers is the primary route — MEA is readily absorbed through skin and can cause acute irritation and sensitisation with single exposures at high concentration. Inhalation during spray application in enclosed spaces. Eye contact from splashes of alkaline ethanolamine-containing cleaning products. Chronic low-level skin contact from TEA-containing personal care products. Nitrosamine formation pathway: TEA and DEA react with nitrite-releasing preservatives in the same product formulation or on skin to generate carcinogenic nitrosamines.
Health concerns
MEA is a respiratory sensitiser — occupational asthma from MEA has been documented in workers using metalworking fluids and cleaning agents. Skin sensitisation and irritant contact dermatitis are well documented. MEA and TEA demonstrate thyroid-disrupting activity in cell and animal studies, inhibiting thyroid peroxidase activity and reducing iodine uptake — a mechanism that could impair thyroid hormone synthesis with repeated exposure. Nitrosamine formation from TEA and DEA is a carcinogenicity concern shared with DEA (see separate profile). The high alkalinity of MEA-containing oven cleaners presents acute hazard — burns to skin, eyes, and mucous membranes from concentrated formulations.
Evidence
Respiratory sensitisation by MEA is established in the occupational medicine literature. Thyroid-disrupting activity of ethanolamines is demonstrated in vitro and in some animal studies — human epidemiological evidence is limited. Skin and eye irritancy at high concentrations is established. The nitrosamine formation pathway is chemically confirmed for TEA and DEA. The overall evidence base is moderate — better for acute hazards and sensitisation than for chronic endocrine effects at domestic concentrations.
Who's most at risk
Workers using heavy-duty MEA-containing oven and degreaser products in catering and domestic environments are at highest risk for respiratory sensitisation. People with thyroid conditions, given the thyroid-disrupting activity of this chemical class. Individuals with eczema or sensitive skin using TEA-containing personal care products daily.
Regulatory status
RegulationEthanolamines are not specifically restricted by concentration in cleaning products in the EU or UK. DEA restrictions in cosmetics under the EU Cosmetics Regulation apply to leave-on products. MEA in cleaning products is covered by general product safety legislation requiring manufacturers to assess risks. CLP labelling requirements apply to concentrated ethanolamine-containing formulations.
How to reduce your exposure
Use oven cleaners only with strong ventilation or outdoors when possible — MEA spray generates significant inhalation exposure in enclosed spaces. Wear gloves and eye protection with heavy-duty ethanolamine-containing cleaners. Consider bicarbonate of soda and water paste as an effective, low-risk alternative for oven cleaning. Check personal care product ingredient lists for triethanolamine (TEA) or diethanolamine (DEA) if you have thyroid conditions or are pregnant.
The nutrition connection
The ethanolamines connect two Nutriofia concern areas: household chemical exposure and thyroid health. Thyroid function underpins metabolism, energy regulation, and mood — and is sensitive to disruption by multiple chemical classes encountered in the domestic environment, from perchlorate in water to ethanolamines in cleaning products. Being aware of this class of compounds is particularly relevant for individuals already managing thyroid conditions, where reducing the total thyroid disruptor load across all sources — food, water, and cleaning products — is a meaningful combined intervention.