Biotin

Synthetic

Skin Conditioner

Hair Care

B Vitamin

Not Clean

1H-Thieno[3,4-d]imidazole-4-pentanoic acid, hexahydro-2-oxo-, [3aS-(3a.alpha.,4.beta.,6a.alpha.)]-

CAS #

58-85-5

Functions

ANTI-SEBUM

HAIR CONDITIONING

A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.

SKIN CONDITIONING

A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.

The paper trail

🔬Peer-reviewednone on file

⚖️Regulatory0 listings

🛡️Safety-assessed1 review →

Counts, not a verdict. A listing isn't a study. The trail, you decide.

CIR Safety Findings

Eye Irritant in Testing

1 study / 1 irritating / reactions slight (CIR 312)

Concentration Guide

Leave-on0.0000002–0.1%

Rinse-off0.000001–0.1%

0%50%100%

CIR reported use · 2016 survey

Verified Jun 2026

Data: CosIng