Coumarin 91-64-5 ●
TL;DR. This ingredient is used primarily as a fragrance component and masking agent, adding a sweet, hay-like, vanilla-adjacent note to scented formulas.
What does Coumarin 91-64-5 do in a cosmetic formula?
This ingredient is used primarily as a fragrance component and masking agent, adding a sweet, hay-like, vanilla-adjacent note to scented formulas.
Is Coumarin 91-64-5 clean?
It has clean-beauty friction because it is a recognized fragrance allergen with EU disclosure thresholds of 0.001% in leave-on products and 0.01% in rinse-off products. IFRA also sets category-specific use limits, so its acceptability depends on concentration and formula type.
Is Coumarin 91-64-5 sustainable?
This material can be made synthetically or obtained from botanical sources, with sourcing quality varying by supplier and fragrance system. It is generally expected to biodegrade, and its main sustainability distinction is whether it comes from natural fragrance feedstocks or petrochemical synthesis.
Is Coumarin 91-64-5 COSMOS-approved?
It can fit COSMOS-natural or COSMOS-organic only when it is part of a compliant natural fragrance system or obtained through allowed natural processes, while synthetic versions do not align with COSMOS natural-fragrance rules. From a Green Chemistry view, it scores better when renewably sourced and used at very low levels, but less well when produced through conventional synthetic fragrance chemistry.
How does Coumarin 91-64-5 work chemically?
The molecule is a small bicyclic aromatic lactone, which explains its odor strength and its ability to sit in the fragrance portion of a formula rather than the water phase. It is typically used at trace to low levels in finished products, is reasonably stable in standard cosmetic pH ranges, and can be limited by IFRA category caps and allergen-labeling thresholds.
Last updated 2026-05-14