Can laundry detergent make your child's allergies worse?

What's actually in it

Laundry detergent contains surfactants, fragrances, enzymes, and optical brighteners. After a wash cycle, some of these chemicals stay trapped in the fabric. When your child wears the clothes or sleeps on the sheets, body heat and movement release tiny particles into the air they breathe.

Kids breathe faster than adults and spend long stretches with their face pressed into pillows and blankets. That means they inhale more detergent residue per pound of body weight than a grown-up would.

What the research says

A 2026 study in Allergy tested what happens when detergent particles are inhaled alongside common allergens. Mice exposed to laundry detergent aerosols developed stronger allergic sensitization than those exposed to allergens alone.

The detergent didn't just irritate the airways. It changed how the immune system responded. Animals that inhaled detergent particles along with allergens had higher levels of allergy-driving immune cells and more severe airway inflammation.

The effect worked even at low concentrations. The researchers found that detergent acts as an "adjuvant," basically a booster that trains the immune system to overreact to things that wouldn't normally cause problems. This could help explain why childhood asthma and allergies have climbed as detergent use has increased.