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4-TERPINEOL.

Valuable CAS 562-74-3 / FRAGRANCE

A refined monoterpene alcohol derived from tea tree oil that delivers potent antimicrobial and anti-inflammatory benefits without the irritation commonly associated with crude botanical extracts. This precision molecule targets microbial overgrowth and inflammatory cascades while maintaining exceptional skin tolerance across all skin types.

antimicrobial anti-inflammatory antioxidant soothing

Science

Disrupts microbial cell membranes through plasmolysis while simultaneously modulating inflammatory pathways by inhibiting key cytokines (IL-1β, IL-6, IL-8, TNF-α) and suppressing monocyte superoxide production. May enhance dermal matrix integrity by stimulating procollagen synthesis and reducing MMP-1 expression.


Research

High confidence
Effective range 1–2%
Optimal

1.5%

Key findings

  1. 01 99% microbial load reduction at 2% concentration with zero irritation score (RIPT 0.0)
  2. 02 Superior Demodex mite elimination at 1% versus equivalent tea tree oil concentrations
  3. 03 Complete absence of erythema and edema at 1.5% after 48-hour patch testing

Transparency

Not commonly dusted

Well-established ingredient with clear concentration guidelines and clinical validation


The Formula

Solubility
Both
Optimal pH 4.5 – 6.5
0 7 14

Stability

Superior stability compared to crude tea tree oil; requires protection from light and oxygen to prevent p-cymene conversion; gel and aqueous formulations show better stability than cream bases

Conflicts

  • alpha-terpineol (antagonistic antimicrobial effects)
  • high-fat cream bases (accelerated degradation)

Safety

CIR Status
Safe as used
Max tested
2%
Sensitization risk Low

Significantly less sensitizing than whole tea tree oil; SCCS recommends 2.0% maximum for rinse-off applications with lower limits for leave-on products


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Valuable

A clinically-validated, well-tolerated antimicrobial that offers the benefits of tea tree oil without the associated irritation risks.


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