Skin Nutrition Wiki · Ingredient encyclopedia
Phenoxyethanol
INCI: Phenoxyethanol · Role: preservative. [5]
The quiet work behind the cream: preservation helps keep a cosmetic usable through storage and repeated use. Its job is to limit microbial spoilage, not to become the headline skin benefit. [1]
One name, a specific molecule
Phenoxyethanol is also called 2-phenoxyethanol or ethylene glycol monophenyl ether. Its molecular formula is C8H10O2; its CAS identity number is 122-99-6. The name is long, but the connectivity is manageable. [2]
A six-carbon aromatic ring.
An oxygen joins the ring to the side chain.
The two-carbon chain ends in an —OH group.
Does “ethanol” in the name mean drinking alcohol?
No. Ethanol is CH3—CH2—OH; phenoxyethanol has the additional ring-and-oxygen structure shown above. It is also not phenol, whose —OH attaches directly to the ring. “Alcohol” describes a chemical feature, not one interchangeable ingredient or a prediction of how skin will feel.
Protecting the product is part of caring for its user
Microbial contamination can spoil a cosmetic and change its performance; it can also create risks for the person using it. Preservatives help reduce that risk. They still need safety evaluation and quality testing: the presence of a preservative is not, by itself, a finished-product test result. [1]
The two studies below answer different questions: where is the preservative available? and what happens to bacteria in a controlled experiment? Neither is a clinical trial of a skincare benefit.
The amount added is not the whole story
In 2018, Puschmann and colleagues studied pharmaceutical oil-in-water emulsion gels. They compared freely available phenoxyethanol with antimicrobial performance. More emulsifier reduced its free fraction through interactions with micelles—small ingredient assemblies. Distribution between the oil and water phases also mattered. [3]
Total amount
What went into the gel
This includes preservative in different environments.
Distribution
Where it resides
Oil, water and micellar associations affect availability.
Free fraction
Available in water
This was linked with antimicrobial effectiveness.
Inside the study
The researchers used equilibrium dialysis to measure free preservative and challenged gels with four bacterial/fungal species. This account uses the abstract, not the full methods. Author affiliations included Almirall Hermal. The practical inference is that formulation context matters; these pharmaceutical gels do not establish how every cosmetic performs.
Why a partner ingredient can change the result
Langsrud and colleagues compared phenoxyethanol, ethylhexylglycerin and their combination in laboratory E. coli suspensions. Ethylhexylglycerin impaired bacterial membrane integrity; together, the ingredients produced stronger killing under the tested conditions. [4]
Observed in the experiment
Membrane leakage, disturbed energy metabolism and reduced bacterial survival accompanied the combination's action.
Not established by it
A cream's shelf life, treatment of skin infections, or effects on the human skin microbiome.
What makes the evidence useful—and limited?
Multiple measurements helped examine a mechanism; membrane leakage alone was not a dependable substitute for measuring bacterial survival. This was neither a finished-cream challenge test nor a human trial. Schülke & Mayr cofunded the work; company coauthors participated in planning, interpretation and publication decisions.
Safety context, without an all-or-nothing verdict
The SCCS's 2016 assessment supported phenoxyethanol as a cosmetic preservative up to 1.0%, within the evidence assessed. It excluded exposure from noncosmetic sources. That conclusion is not a promise of individual tolerance or an endorsement of every finished formula. [5]
Read the ingredient, then the whole product
The useful question is not simply “Is this name good or bad?” Separate identity, preservation performance and personal experience. A chemical name answers the first question; it cannot answer all three.
Is a preservative blend the same thing as phenoxyethanol?
No. A single ingredient and a multi-ingredient blend are different subjects. For a blend-specific example, continue to Optiphen Plus; do not transfer its entire composition or properties to this molecule.
Sources & evidence notes
Primary identity data, original experiments and an official assessment are separated here. No product or skin testing was performed for this entry.
[1] European Commission. Preservatives: their role in cosmetics.
[2] NIST Chemistry WebBook. 2-Phenoxyethanol identity and structure.
[3] Puschmann, Herbig & Müller-Goymann (2018). Free phenoxyethanol and antimicrobial effects in emulsion gels. DOI: 10.1016/j.ejpb.2018.08.007. Abstract inspected.
[4] Langsrud et al. (2016). Ethylhexylglycerin, membrane integrity and phenoxyethanol. DOI: 10.1371/journal.pone.0165228. Full text inspected.
[5] SCCS/1575/16. Phenoxyethanol opinion, final 6 October 2016.
