Dehydroacetic Acid
⚠ EU RestrictedIdentification
CAS Number 520-45-6
EINECS / EC 208-293-9
CosIng Ref 33185
Chemical Name 3-acetyl-6-methyl-2H-pyran-2,4(3H)-dione,
Formula C8H8O4
Mol. Weight 168.15 g/mol
Function & Classification
Primary Function Preservative
Origin Synthetic
Category Preservatives
EU Regulatory Status
Max Leave-on 0.6%
Max Rinse-off 0.6%
Restrictions 0.6%
Conditions of Use Max 0.6% (as acid).
Safety Profile
2 / 10
Comedogenic Rating: 1/5
Low risk — should be fine for most skin types
Skin Type Compatibility
Acne-Prone ✓ Safe
Fungal Acne Safe ✓ Safe
No toxicology data available yet for this ingredient.
Check SCCS opinions or CIR reports for published safety assessments.
NOAEL · Dermal Absorption % · Sensitization
Formulation Guidelines
Usage level, pH range, solubility and addition phase not yet available.
Usage Level % · Addition Phase · Solubility
Suppliers & Documents
No verified suppliers listed for this ingredient yet.
Are you a supplier of Dehydroacetic Acid? Register as a supplier to add your listing and upload TDS & SDS documents.
Documents