Hexylene Glycol

Hexylene glycol is a solvent/humectant used typically around ~0.5–5% (sometimes higher) to improve texture and enhance penetration. Clinical and patch-test data generally show low irritation at common levels, but it can sting or irritate compromised skin (eczema, barrier disruption) and around the eyes, especially in leave-on products or when paired with other irritants. Given its known potential for irritant contact dermatitis in reactive patients despite being widely tolerated, I rate it as mild rather than “gentle.” Safety Notes: Hexylene glycol is used in consumer skincare primarily as a solvent/humectant and preservative-booster, and it often appears at low levels (~0.1–1%) in leave-on creams/serums and many rinse-off cleansers where it supports solubilization and sensory. In higher-solvent systems (toners/essences, makeup-removing liquids, exfoliant/active solutions), commercial OTC products commonly reach ~3–5% and, more rarely, up to about 10% where stronger solvency and antimicrobial-boost effects are needed. Hexylene glycol is not subject to a specific EU/FDA maximum for cosmetics, so the practical upper end is typically set by irritation/sensory limits and formula compatibility rather than a hard regulatory cap.