Decylene Glycol

Decylene Glycol is primarily used as a humectant/solvent with notable antimicrobial/“deodorizing” activity, typically around ~0.5–5% in leave-on products (higher in some deodorant-type formulations). While many tolerate it, its antimicrobial nature and patch-test experience show it can cause mild irritant reactions and stinging in reactive or compromised (eczema/barrier-impaired) skin, especially with cumulative exposure in multi-step routines. Given sensitive-skin safety priorities and non-trivial irritation reports compared with more inert glycols, a mild irritancy score is warranted. Safety Notes: In commercial OTC cosmetics, decylene glycol is commonly used as a preservative booster/humectant and antimicrobial aid at very low levels (about 0.05–0.5%) in leave-on creams/serums and rinse-off cleansers. Higher concentrations are seen in consumer-available deodorants, anti-fungal/anti-odor foot products, and targeted "blemish/odor control" sprays where it is used as a primary antimicrobial/solvent/humectant, reaching ~2–10%. Above ~10% is uncommon in mainstream skincare due to tack/skin feel and irritation constraints, and most high-strength use is still OTC but confined to niche antimicrobial/odor-control formats.