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COUMARIN.

Avoid CAS 91-64-5 / PERFUMING

A fragrant organic compound naturally found in plants like tonka beans and sweet clover, utilized primarily for its distinct sweet, hay-like aroma. While it offers secondary anti-inflammatory potential, it is strictly monitored in precision skincare due to its status as a known fragrance allergen.

fragrance masking

Science

Primarily functions as a scent component. At a cellular level, it has shown an ability to modulate inflammatory responses by assisting in the removal of protein-rich edema fluid from tissue and inhibiting specific enzymes like carbonic anhydrase and monoamine oxidases.


Research

Medium confidence
Effective range 0.001–0.1%
Optimal

0.1%

Key findings

  1. 01 Next-Generation Risk Assessment models indicate a high margin of safety (>100) for systemic exposure when used in leave-on face and body products.
  2. 02 Patch testing on fragrance-sensitive individuals showed positive allergic reactions in approximately 1.2% to 6.8% of cases, though non-sensitized groups showed no reaction.

Transparency

Not commonly dusted
Min. effective
0.001%
Red flag below
0.01%

As a fragrance allergen, high concentrations are a liability rather than a benefit. In leave-on products, concentrations exceeding 0.001% must be disclosed on labels to protect sensitized users.


The Formula

Solubility
Both
Optimal pH N/A
0 7 14

Stability

Highly soluble in oils and alcohols, with limited solubility in cold water (0.17%). It displays pH-dependent fluorescence and remains stable for approximately three weeks when stored at 6°C in dark conditions.


Safety

CIR Status
Deferred to IFRA
Max tested
0.01%
Pregnancy
Safe
Sensitization risk Moderate

Regulated by the EU SCCS; mandatory labeling is required if concentration exceeds 0.001% in leave-on and 0.01% in rinse-off products. It is prohibited as a direct food additive by the FDA.


Your Skin

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Moderate
Comedogenicity Unknown

Our Assessment

Avoid

While useful for olfactive appeal, its potential for sensitization makes it unsuitable for precision skincare targeting compromised or sensitive skin barriers.


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