An allergen was any substance that could cause an allergic reaction.
In 2377, The Doctor gave Neelix something to counteract any allergens he might encounter in the atmosphere of a planet he was about to visit. (VOY: "Tinker Tenor Doctor Spy")
Known allergens[]
- Bee venom
- Benzethonium chloride
- Chocolate
- Icoberry juice
- Inkarian wool
- Insect bites
- Leola ointment
- Metorapan
- Retinax V
- Water
- Viscoelastic polyurethane foam