Hydroxycaprylic Acid

AKA: 2-Hydroxyoctanoic acid, 617-73-2, 2-Hydroxycaprylic acid, Octanoic acid, Alpha-Hydroxycaprylic acid, Alpha-Hydroxyoctanoic acid, DL-2-Hydroxyoctanoic acid, DL-2-Hydroxycaprylic acid, .alpha.-Hydroxycaprylic acid
Synthetic
Skin Conditioner
Acid
Not Clean
OriginTypically derived from coconut, palm kernel, or other plant oils containing caprylic acid. Produced through oxidation or fermentation of caprylic acid to introduce hydroxyl functional groups.
The CIR Expert Panel concluded that the following ingredients are safe in the present practices of use and concentration described in the safety assessment when formulated to be non-irritating and non-sensitizing, which may be based on a QRA...Hydroxycaprylic Acid...
Solubility 927 mg/mL
Formula
C8H16O3
Mol. Weight
160.21
CAS #
617-73-2
Form
Liquid
State
Solid
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Locks in moisture
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
3
CIR
Safe as used
Pregnancy
Yes
Concentration Guide
Leave-on0.076%
Rinse-off0.076%
0%50%100%
CIR reported use · 2016 survey
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR