Ingredient dictionary

Chlorphenesin

Chlorphenesin is a synthetic preservative that mainly keeps mold and yeast from growing in a product, so it stays fresh on the shelf. It is on the label of 65 products in our library. Checked against our library November 6, 2026.

What Chlorphenesin does

Keeps mold and yeast from growing
Works alongside other preservatives
Helps products stay fresh after opening

Chlorphenesin is a lab-made molecule, not something harvested from plants or animals. It combines a chlorine-containing phenol with a glycerin-like piece. Formulators use it because it works well against mold and yeast, which can grow in water-based products over time.

In a finished formula, it is usually a small part of the mix and blends easily into water-based products without changing how they smell or look. It is often paired with a second preservative, since using two helps cover a wider range of microbes. Most people never notice it, which is the point of a good preservative.

Good for

Suits most skin and hair types, since it is used in small amounts in many everyday water-based products.

Frequently asked questions

Is chlorphenesin safe for skin?

Chlorphenesin is generally well tolerated and appears in many everyday skincare products. Like any preservative, it can rarely irritate sensitive skin. If a product stings or turns red, stop using it and ask a dermatologist for advice.

Why is chlorphenesin in shampoo?

Shampoo is mostly water and is used again and again in a damp bathroom, so it needs protection from microbes. Chlorphenesin helps keep it fresh between uses. It is one of several preservatives a formulator may choose for rinse-off and leave-on products alike.