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Moumoujus

MENTHOL.

Valuable CAS 1490-04-6 / 2216-51-5 / 89-78-1 / 15356-70-4 / DENATURANT, FRAGRANCE, REFRESHING, SOOTHING

Menthol is a cyclic alcohol derived from peppermint, renowned for its immediate cooling sensation on the skin. It also provides targeted relief through its potent anti-inflammatory, analgesic, and antimicrobial properties, making it a multifaceted ingredient for diverse skincare applications.

Summary

Cooling agent Anti-inflammatory Painkilling (Analgesic) Itch-reducing (Antipruritic) Antimicrobial (Antibacterial, Antifungal) Penetration enhancing Antioxidant support Wound healing support Fragrance masking Perfuming

Science

Mechanism of Action

Menthol exerts its primary effect by activating Transient Receptor Potential Melastatin 8 (TRPM8) receptors within the skin's sensory nerves, signaling a cooling sensation to the brain without actual temperature reduction. Beyond this, it acts as a counter-irritant, offering localized numbing and influencing pain signal pathways. Menthol has also been shown to enhance skin penetration for other ingredients, reduce pro-inflammatory markers (such as IL-6 and TNF-α) while increasing anti-inflammatory interleukin (IL)-10, and promote wound healing through improved epithelialization and antioxidant defense.

Research

Clinical Evidence

High confidence
Effective range 0.25–3%
Optimal

1%

Key findings

  1. 01 Concentrations from 0.25% to 0.5% have demonstrated strong anti-inflammatory effects by suppressing oxidative stress and down-regulating i-NOS gene expression, contributing to the repair of toxin-induced skin inflammation and accelerating wound closure.
  2. 02 A 1% concentration is the FDA-approved standard for topical preparations, effectively providing cooling, antipruritic, and general symptom relief.
  3. 03 Up to 3%, menthol is considered safe and effective in moisturizing creams for reducing moderate to severe pruritus, offering stronger itch-relief benefits.
  4. 04 At 4.6%, a strong cooling sensation is perceived, although this concentration does not significantly alter actual skin temperature compared to lower doses.

Transparency

Dusting Analysis

Not commonly dusted

The provided research does not indicate widespread 'dusting' of menthol, as its effects are concentration-dependent and well-documented across specific ranges.

The Formula

Formulation

Solubility
Oil
Optimal pH 4 – 8
0 7 14

Stability

Menthol exhibits good stability under recommended storage conditions and within a pH range of 4-8. Its low water solubility necessitates specific incorporation techniques: it can be melted at 50-60°C and added to emulsions at 40-45°C, or pre-dissolved in organic solvents such as cosmetic oils or glycol solvents for optimal dispersion.

Conflicts

  • Avoid concurrent application with heat sources (e.g., heating pads, hot water) due to flammability risks and potential for severe burns or over-absorption leading to skin tissue damage.
  • Do not apply to compromised skin, including damaged, scratched, raw, inflamed skin, eczema flare-ups, or rashes, as it can exacerbate these conditions.
  • High concentrations should be avoided on sensitive mucosal areas such as eyelids or lips.
  • Co-formulation with certain essential oils (e.g., peppermint oil, eucalyptus, camphor) may increase the incidence of contact allergy.
  • Concentrations exceeding 3% carry an increased risk of irritation and cold allodynia.

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
3%
Sensitization risk Moderate

Menthol is listed by the FDA as Generally Recognized As Safe (GRAS) for OTC products, with 1% being the standard approved topical concentration. Studies indicate it is not genotoxic or carcinogenic. However, the SCCS includes menthol as a fragrance allergen subject to restrictions (e.g., purity, maximum concentration). While rare, allergic sensitization can occur, particularly when combined with other essential oils. Concentrations above 3% increase the risk of irritation, burning, redness, and cold allodynia, especially on compromised skin.

Your Skin

Skin Compatibility

Yes Normal
No Dry
Yes Oily
No Sensitive
Irritancy Medium
Comedogenicity Low

Our Assessment

Verdict

Valuable

Menthol is a valuable ingredient for normal to oily skin types, offering significant cooling, anti-inflammatory, and analgesic benefits when precisely formulated within its safe and effective concentration range (typically 0.25% to 3.0%), mitigating its moderate irritancy potential, especially for sensitive or compromised skin.

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