Preservatives in skincare — what they do
⚡ Quick answer: Preservatives keep water-based formulas safe from microbial growth. Modern, well-tolerated systems are why your essence stays safe for months.
Preservatives keep water-based formulas safe from microbial growth. Modern, well-tolerated systems are why your essence stays safe for months.
18 preservatives in the K-beauty INCI decoder
- Benzoic Acid — A preservative that helps prevent the growth of mold and bacteria to keep a product safe.
- Benzyl Alcohol — A naturally occurring preservative and solvent that helps protect a product from spoilage.
- Butylparaben — A preservative that helps guard a formula against bacteria and mold over its shelf life.
- Chlorphenesin — A preservative that helps protect a product from microbial growth so it keeps fresh through use.
- Dehydroacetic Acid — A preservative that helps keep a product free of microbes so it stays fresh and safe.
- Diazolidinyl Urea — A preservative that helps keep a product free of microbes to maintain freshness.
- DMDM Hydantoin — A preservative that helps prevent bacterial growth so a product stays safe to use.
- Ethylhexylglycerin — A gentle preservative booster that supports other preservatives while also softening and conditioning the skin.
- Ethylparaben — A preservative that helps keep a product stable and safe by limiting bacterial growth.
- Imidazolidinyl Urea — A preservative that helps protect water-based products from bacterial contamination.
- Methylchloroisothiazolinone — A potent preservative (used with methylisothiazolinone) effective at very low levels; restricted to rinse-off products due to allergy risk.
- Methylisothiazolinone — A potent preservative used in very small amounts, mainly in rinse-off products; a frequent contact allergen now restricted in leave-on products.
- Methylparaben — A long-established preservative that helps keep a product free from bacteria and fungus.
- Phenoxyethanol — A widely used preservative that helps keep a product free of bacteria and mold so it stays safe to use over time.
- Potassium Sorbate — A mild food-grade preservative that helps stop yeast and mold from growing in a product.
- Propylparaben — A preservative from the paraben family that helps protect a formula from microbial spoilage.
- Sodium Benzoate — A gentle preservative that helps keep a formula stable and free from bacteria during its shelf life.
- Sorbic Acid — A gentle preservative that helps protect a formula against yeast and mold.
Decode any ingredient list free →
Explore the full K-beauty hub →✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed 2026-06-21.
General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.