What it is
Decyl glucoside is a nonionic surfactant of the alkyl polyglucoside family, made by condensing decyl alcohol (a fatty alcohol) with glucose. The glucose end is water-loving and the fatty chain is oil-loving, so the molecule lifts away oils and impurities and generates foam while staying gentle. It is widely valued as a mild, readily biodegradable cleanser and foam booster, and in emulsions it can help stabilize the mixture. In sunscreens and cleansers it is used to clean or co-emulsify without the harshness of stronger anionic surfactants.
Safety & warnings
Alkyl glucosides like decyl glucoside are generally considered low in irritancy and are popular for sensitive-skin and baby products, but they are recognized as emerging contact allergens and decyl glucoside has been included in standard patch-test allergen panels. Reported allergic reactions are sometimes linked to it appearing as a hidden component within other raw materials, and trace acrylate impurities from manufacturing have been proposed in some cases. Most users tolerate it well, but those with a known alkyl glucoside allergy should avoid it and may cross-react with lauryl glucoside.
Origin & sourcing
It is plant-derived, made from renewable raw materials: glucose (from starch) combined with a fatty alcohol obtained from sources such as coconut or palm kernel oil. The fatty alcohol and sugar are joined under acid catalysis at elevated temperature to form the alkyl polyglucoside.
Questions everyone asks
Is decyl glucoside gentle?
Yes, it is regarded as a mild, low-irritancy nonionic surfactant, which is why it is common in sensitive-skin and gentle cleansers.
Is it natural?
It is plant-derived, made from glucose and a fatty alcohol from sources like coconut or palm kernel oil, and it is readily biodegradable.
Can it cause allergies?
Uncommonly, yes. It is a recognized emerging contact allergen and appears on patch-test panels, so people with a known alkyl glucoside allergy should avoid it.