Beta-Sitosteryl Acetate

AKA: Beta-Sitosterol acetate, 915-05-9, Sitosterol acetate, .beta.-Sitosterol acetate, 3beta-Acetoxystigmast-5-ene, Stigmast-5-en-3-ol, .beta.-Sitosteryl acetate, Stigmast-5-en-3beta-yl acetate
Synthetic
Skin Conditioner
Not Clean
Stigmast-5-en-3-.beta.-yl acetate
Formula
C31H52O2
Mol. Weight
456.70
CAS #
915-05-9
Form
Powder
Functions
Light Stabilizer
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
Shields from UV damage
Traditional Use
Beta-sitosterol is a plant sterol found in many traditional plant oils and seeds. This acetylated version was synthesized to improve stability and skin conditioning properties in modern skincare products.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Skin Types
all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing
🛡️Safety-assessed1 review
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR