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Researched by Helena DeMaria-Williams

Formula IngredientPreservative

Chlorphenesin

INCI: Chlorphenesin

Chlorphenesin is a broad-spectrum antimicrobial preservative used in cosmetic formulations to inhibit the growth of bacteria, fungi, and yeast, thereby extending product shelf life. It is a glycerol ether (3-(4-chlorophenoxy)-1,2-propanediol) that works by disrupting microbial cell membranes. It is most commonly used in combination with phenoxyethanol, where the two compounds act synergistically to provide more effective preservation than either alone.

Category

Preservative

Irritation Risk

Low

Skin Types

all skin types, oily, acne-prone, fungal acne-prone, sensitive

What does this do in a formula?

broad-spectrum preservation, antimicrobial protection, antifungal activity, extends product shelf life

Is Chlorphenesin safe? Key considerations

Can Chlorphenesin cause irritation?

Low Risk

Generally well tolerated at typical use concentrations. Rare cases of contact allergy and irritant reactions have been reported, particularly in sensitive individuals. The EU Cosmetics Regulation (Annex V, entry 31) restricts chlorphenesin to a maximum concentration of 0.3% in cosmetic products. It is not listed under Annex II (banned) or Annex III (restricted actives).

Does Chlorphenesin increase sun sensitivity?

No Risk

Chlorphenesin is a preservative with no photosensitising properties. No special sun protection measures are required due to its presence in a formulation.

Is Chlorphenesin safe during pregnancy?

MANUAL REVIEW: Limited human data available for topical use during pregnancy. Animal studies at high oral doses show some developmental toxicity, but these are not considered relevant to low-concentration topical cosmetic use (max 0.3%). Considered low risk at cosmetic concentrations but no formal safety classification exists for topical use in pregnancy.

No established pregnancy safety category exists for topical chlorphenesin in cosmetics. It is used at a maximum of 0.3% in leave-on products under EU regulations. Systemic absorption through intact skin at these concentrations is expected to be minimal. As a precaution, those who prefer to avoid novel preservatives during pregnancy may wish to seek alternatives, but the risk from cosmetic use is considered very low.

How does Chlorphenesin work?

Chlorphenesin is a broad-spectrum antimicrobial preservative used in cosmetic formulations to inhibit the growth of bacteria, fungi, and yeast, thereby extending product shelf life. It is a glycerol ether (3-(4-chlorophenoxy)-1,2-propanediol) that works by disrupting microbial cell membranes. It is most commonly used in combination with phenoxyethanol, where the two compounds act synergistically to provide more effective preservation than either alone.

Individuals with known contact allergy to chlorphenesin or glycerol ether compounds should review the considerations above before use.