Thymol

Also known as: Thyme Oil Component

INCI: Thymol | Function: Antimicrobial, Preservative, Anti-inflammatory | Type: Soothing

What Is Thymol?

Thymol is the primary monoterpene phenol found in thyme essential oil with potent broad-spectrum antimicrobial activity against bacteria, fungi, and viruses. In skincare, it is used as a natural preservative alternative and as an active ingredient for acne-prone skin (targeting P. acnes and S. aureus). Also demonstrates anti-inflammatory properties through COX-2 inhibition. Stronger antimicrobial than many synthetic preservatives at low concentrations.

Key Skin Benefits

+ Broad-spectrum antimicrobial — bacteria, fungi, viruses
+ Effective against P. acnes — acne treatment
+ COX-2 inhibition — anti-inflammatory
+ Natural preservative alternative
+ Effective at very low concentrations (0.1-0.5%)

Pros

+ + Potent natural antimicrobial
+ + Effective against acne bacteria
+ + Anti-inflammatory
+ + Natural preservative option
+ + Works at low concentrations

Cons

− − Strong scent — may be overpowering
− − Can be irritating at higher concentrations
− − Phenol sensitivity in some individuals
− − Photosensitizing in its pure essential oil form

Specifications

Property	Value
Usage Areas	Face, Body
Product Type	Leave-On, Rinse-Off
Source	Thyme / Ajowan essential oil
Natural Level	Natural

Safety Ratings

Metric	Rating
Skin Sensitivity	3/5
Comedogenic Rating	0/5
EWG Score	2/10

Regional Regulatory Limits

Region	Leave-on %	Rinse-off %	Status
EU (CosIng)	Up to 0.5% (leave-on)	No limit	Allowed — restricted
US (CIR/FDA)	No limit	No limit	Allowed
Japan (MHLW)	Up to 0.5%	No limit	Allowed
ASEAN	Up to 0.5%	No limit	Allowed — follows EU
China (NMPA)	No limit	No limit	Allowed

Typical Usage % by Product Type

Product Type	Typical %
Acne Treatment	0.1 - 0.5%
Cleanser	0.1 - 0.3%
Preservative system	0.05 - 0.3%

References

Marchese A et al. — Thymol antimicrobial activity. Food Control (2016)
Braga PC et al. — Thymol anti-inflammatory. Arzneimittelforschung (2006). PMID: 16889136
Burt S — Essential oils as antimicrobials. Int J Food Microbiol (2004). PMID: 15380872

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