6-HYDROXYINDOLE

Description: 6-HYDROXYINDOLE — HAIR DYEING.

All Functions: HAIR DYEING

Quick Facts:

• Category: other

Proven Benefits At A Glance:

• 6-hydroxyindole is an oxidative hair dye ingredient — meaning it works through a chemical oxidation process to color hair
• Safety experts have determined it is safe for use in oxidative hair dye formulations
• It was evaluated by the Cosmetic Ingredient Review Expert Panel based on animal and human safety data

Safety tier is a starting heuristic from regulatory status and comedogenic rating, not a dermatological verdict — see our Terms for the full disclaimer. Research confidence reflects how many real cited studies back this ingredient, not the strength of their findings.

🧪 6-HYDROXYINDOLE

6-HYDROXYINDOLE

CAS Number: 2380-86-1

Also Known As: —

Category: other

EC Number: 417-020-4

Korean Name: 6-히드록시인돌

1H-indol-6-ol

6-HYDROXYINDOLE is an other ingredient used in skincare formulations.

🌍 Regulatory Status

📊 Comedogenicity

📚 Research & Evidence

🔬 The Science

6-hydroxyindole is a chemical compound used in hair coloring products that work via oxidation — a process where the ingredient undergoes a chemical reaction to develop color. According to the International Journal of Toxicology (2014), the Cosmetic Ingredient Review Expert Panel, which is an independent body that assesses cosmetic ingredient safety, reviewed available animal and human safety data for this ingredient and concluded that #1: 6-hydroxyindole is safe for use in oxidative hair dye formulations. The sources provided offer limited detail beyond this safety determination — they do not specify how the ingredient functions mechanically, what concentrations are used in products, or comparative performance data against other hair dye ingredients.

If you’re curious about specific application rates, efficacy studies, or how it compares to alternative dyes, those details are not covered in the available research summaries.

💧 Skin Type Compatibility

⚠️ Don’t Combine With

🧴 Products Containing 6-HYDROXYINDOLE

• L’OREAL NORGE AS Preferance 4.15 Caracas
• L’OREAL NORGE AS Excellence 9 Meget Lys Blond
• L’OREAL NORGE AS Casting Creme Gloss 415 Marron Glace
• L’Oréal Paris Superior Preference 5CB Medium Chestnut Brown Warmer Haircolor
• L’OREAL NORGE AS Casting Creme Gloss 600 Blond Fonce
• L’Oréal Фарба для волосся L’Oreal Paris Preference 5.0
• L’OREAL NORGE AS Nutrisse 4.15 Marron Glace
• L’OREAL NORGE AS Nutrisse 3.23 Brun
• L’OREAL NORGE AS Excellence 5.3 Lys Gyldenbrun

📄 Related Research

Matched by search — not necessarily verified support for every statement above.

• Burnett CL et al. (2014). Safety assessment of 6-hydroxyindole as used in cosmetics. Int J Toxicol.