Caprylyl Glycol

At a glance

CAS number

1117-86-8

INCI name

Caprylyl Glycol

Function

preservative, humectant, emollient, antimicrobial booster

Typical use level

0.3%–1.5%

Solubility

both

Stable pH

3–8

CAS number and synonyms are sourced from PubChem. Function, usage levels, pH and compatibility are AI-assisted formulation guidance — verify against your supplier's technical data sheet and applicable regulations before use.

Also known as

1,2-Octanediol Octylene Glycol 2-Methyl-1,3-propanediol Symclariol

Compatibility

Works well with:
Phenoxyethanol Ethylhexylglycerin Glycerin Niacinamide Hyaluronic Acid Hexylene Glycol

Caprylyl Glycol is frequently combined with Phenoxyethanol and/or Ethylhexylglycerin to create broad-spectrum preservation systems with a strong synergistic effect, allowing lower use levels of each component. It is generally compatible across a wide range of cosmetic ingredients and formulation types. No significant incompatibilities are well-documented, though performance should be validated in high-surfactant systems where antimicrobial efficacy may be reduced.

Formulation notes

Caprylyl Glycol (1,2-octanediol) is a multifunctional diol that provides antimicrobial activity primarily against gram-positive bacteria and some fungi, making it a popular preservative booster or co-preservative rather than a stand-alone preservative. It also contributes mild skin-conditioning and emollient properties, improving skin feel in formulations. It is considered a mild, well-tolerated ingredient and is frequently featured in 'free-from' preservative marketing when used without traditional preservatives, though its antimicrobial function should still be substantiated with challenge testing.

Frequently asked questions

Related ingredients

• Butylene GlycolHumectant
• Glyceryl CaprylateEmollient
• PanthenolHumectant
• Pentylene GlycolHumectant
• Propylene GlycolHumectant
• UreaHumectant