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LIPPIA SIDOIDES LEAF OIL.

Questionable CAS 8024-12-2 / FLAVOURING, FRAGRANCE, PERFUMING

Lippia sidoides Leaf Oil is an essential oil traditionally recognized for its antiseptic properties on skin and mucous membranes. Research indicates a complex profile, demonstrating both acute anti-inflammatory and significant pro-inflammatory effects depending on concentration and duration of topical application, alongside notable antimicrobial activity.

flavouring fragrance perfuming antiseptic antimicrobial anti-inflammatory antioxidant

Science

This volatile oil exerts antiseptic and antimicrobial actions primarily due to its major components, thymol and carvacrol, which exhibit antagonistic activity against various microorganisms. Its anti-inflammatory properties, particularly in acute contexts, are linked to its thymol content, contributing to edema reduction. Furthermore, it possesses antioxidant effects that can support its anti-inflammatory actions.


Research

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Topical application significantly reduced acute ear edema in mouse models at 1 mg/ear (45.93% reduction) and 10 mg/ear (35.26% reduction), and generally at 2 mg/ear.
  2. 02 Hexane fraction demonstrated antifungal activity against Cryptococcus sp. ATCC D at a minimum inhibitory concentration (MIC) of 31.25 µg/mL, and against Cryptococcus gatti L48 at an MIC of 62.5 µg/mL.
  3. 03 However, topical application of Lippia sidoides essential oil in ointments at 6% and 12% promoted cutaneous inflammation (increased skin thickness, edema, and erythema) with continuous use in rats, though it did not delay wound healing.

Transparency

Commonly dusted
Min. effective
Below 6% for continuous topical use in rats.%
Red flag below
6%

Despite exhibiting acute anti-inflammatory effects at low doses in certain models, continuous topical application, even at concentrations such as 6% and 12%, has been shown to induce cutaneous inflammation. This contrasts with its potential benefits and can lead to its 'dusting' if formulation guidelines regarding concentration and application frequency are not strictly adhered to, risking adverse reactions rather than intended benefits.


The Formula

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

As a volatile oil, its chemical composition can vary significantly based on geographical origin, climatic conditions, and chemotypes, requiring careful sourcing for consistency. It is susceptible to instability from light and temperature, necessitating protective measures such as micro/nanoencapsulation to enhance its stability and efficacy in cosmetic formulations. It is soluble in alcohol but insoluble in water.


Safety

CIR Status
Not reviewed
Sensitization risk High

Acute oral administration in mice up to 3 g/kg and 30-day oral administration in rats up to 117.95 mg/kg/day did not show overt toxicity or significant systemic alterations. However, topical application is problematic: it promoted cutaneous inflammation (increased skin thickness, edema, erythema) in mice at high concentrations or with multiple dosages. It can induce a proinflammatory effect if applied topically for more than one day. This ingredient is regulated in Europe, Brazil, the United Kingdom, and Serbia.


Your Skin

No Normal
No Dry
No Oily
No Sensitive
Irritancy High
Comedogenicity Unknown

Our Assessment

Questionable

Despite some acute anti-inflammatory and antimicrobial benefits, the significant risk of inducing cutaneous inflammation with continuous topical use, even at moderate concentrations, makes this ingredient questionable for general precision skincare applications.


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