Scented Dish Soap

Scented dish soaps expose hands to a concentrated fragrance mixture every time dishes are washed — one of the more frequent and sustained skin-contact exposures in most households. Dish soap is rinse-off, which limits systemic absorption compared to leave-on products, but the frequency of contact (multiple times daily for many people) and the concentration of fragrance in the product create meaningful cumulative exposure.

Fragrance in consumer products is regulated as a trade secret in the US, meaning the individual chemicals in a 'fragrance' blend don't have to be disclosed on the label. Research by the Environmental Working Group and independent fragrance safety organizations has identified phthalates (plasticizers used to help scent adhere and last longer), synthetic musks, and various sensitizing aromatic compounds as components of typical dishwashing fragrance blends. Phthalates have been studied as endocrine-disrupting compounds, with ongoing research on reproductive and developmental effects at typical consumer exposure levels.

Methylisothiazolinone (MI) and methylchloroisothiazolinone (MCI), preservatives found in some dish soap formulas, are categorized as contact allergens. The European Chemicals Agency has restricted their concentration in rinse-off products after widespread reports of skin sensitization. Once sensitization develops, even trace exposures can trigger reactions. This is particularly relevant for people who wash dishes frequently by hand.

For households with anyone who has eczema, hand dermatitis, fragrance sensitivity, or young children helping with dishes, the switch to a certified fragrance-free dish soap is a straightforward risk reduction measure. The cleaning performance of fragrance-free formulas is identical — fragrance contributes nothing to the cleaning chemistry.