Biosaccharide Gum-4
molecular structure · PubChem
AKA: Fermented Polysaccharide
Plant-Derived Synthetic
Skin Conditioner
Clean
Biosaccharide Gum-4 is a fermentation gum derived from sorbitol. It is a deacetylated branched polymer consisting of L-fucose, 2-D-glucose and glucuronic acid repetitive units
Effective at 3.0%
CAS #
905593-86-4
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
Traditional Use
A synthetic polysaccharide created through fermentation and biotechnology in the late 20th century. Developed as a skin-conditioning and hydrating agent in modern skincare formulations.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
ewg-1
medical-approval
pregnancy-nursing-safe
all-shades-safe
Concentration Guide
0.0004%
6.0%
0%8%
Reported use
CIR reported use: 0.0004-0.5 | 0.002-6
Regulatory Agencies
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
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.
Verified Jun 2026
Data: CosIng · EWG · CIR