4,5-DIAMINO-1-METHYLPYRAZOLE HCL

Other

3

Avoid

CAS Number: 21616-59-1

About 4,5-DIAMINO-1-METHYLPYRAZOLE HCL

A synthetic hair dye colorant that falls into the highest-concern bucket because the EU bans it from cosmetic use.

Detailed Analysis

This ingredient is used as a hair dye colorant, but its Annex II listing means it is not allowed in EU cosmetics. Hair-dye materials in this class are also more likely than ordinary skincare ingredients to irritate skin or trigger allergy, so a very low score is the cautious call.

What It Does

HAIR DYEING

Known Concerns

  • ⚠ EU banned for cosmetic use
  • ⚠ Hair dye sensitization risk
  • ⚠ May irritate skin or eyes

Safety Score

3

Avoid

Based on EU regulatory data, published safety research, and ingredient function analysis.

References

🏛

EU CosIng Database

European Commission cosmetic ingredient registry

Check your products for 4,5-DIAMINO-1-METHYLPYRAZOLE HCL

Scan any cosmetic product to see if it contains this ingredient and get a full safety breakdown.

Download LuxSense

This information is for educational purposes only and does not constitute medical advice. Always consult a healthcare professional for skin concerns or allergies.