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MELALEUCA ALTERNIFOLIA LEAF/ROSMARINUS OFFICINALIS LEAF/THYMUS VULGARIS LEAF EXTRACT.

Valuable CAS - / SKIN CONDITIONING

This precision botanical blend combines extracts from Tea Tree, Rosemary, and Thyme, delivering a comprehensive approach to skin health. It is scientifically recognized for its robust antimicrobial, antioxidant, and anti-inflammatory properties, making it an optimal ingredient for addressing concerns such as blemishes, excess sebum, and oxidative stress.

Summary

Antimicrobial/Antibacterial Antioxidant Soothing Skin-Conditioning Perfuming Astringent

Science

Mechanism of Action

This synergistic extract blend exerts its effects through multiple distinct biochemical pathways. Melaleuca Alternifolia (Tea Tree) Leaf Extract functions primarily as an antiseptic and antibacterial agent by disrupting bacterial cell membranes, leading to impaired cellular respiration and loss of homeostasis, particularly via its active components like terpinen-4-ol and 1,8-cineole. Rosmarinus Officinalis (Rosemary) Leaf Extract provides potent antioxidant defense, neutralizing free radicals and mitigating signs of premature aging. It also exhibits anti-inflammatory and antimicrobial activities, aided by phenolic acids such as rosmarinic and carnosic acids, which also contribute to improved circulation, collagen production, and astringent, oil-balancing effects. Thymus Vulgaris (Thyme) Leaf Extract further enhances antioxidant protection against oxidative stress and demonstrates significant antimicrobial efficacy, particularly against *Cutibacterium acnes*, by compromising bacterial cell membrane integrity. Thyme also offers anti-inflammatory benefits, reducing redness and soothing irritation by blocking pro-inflammatory pathways and suppressing COX-2 enzyme activity, with key components including thymol and carvacrol.

Research

Clinical Evidence

High confidence
Effective range 0.2–5%
Optimal

N/A

Transparency

Dusting Analysis

Commonly dusted
Min. effective
0.1%
Red flag below
0.1%

Given that individual components such as Tea Tree Oil and Thyme extract have demonstrated significant efficacy for acne treatment at concentrations up to 5%, and Rosemary extract is typically utilized between 0.2% and 5%, a blend formulated below 0.1% may not deliver the anticipated therapeutic benefits, indicating potential 'dusting'.

The Formula

Formulation

Solubility
Water
Optimal pH 3.9 – 7.2
0 7 14

Stability

The Melaleuca Alternifolia (Tea Tree) component is susceptible to chemical degradation upon exposure to light, heat, air, and moisture, necessitating robust stability considerations in formulation. Thyme Extract should be integrated into the water phase during the cool-down stage of formulation, ideally below 40-50°C, to preserve its heat-sensitive active compounds.

Synergies

  • Complementary anti-acne ingredients
  • Additional antioxidants
  • Soothing and barrier-supporting agents

Conflicts

  • Alcohol-based toners (potential compatibility issues with Rosemary extract)

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
0.1%
Pregnancy
Caution
Sensitization risk Moderate

The comprehensive blend itself has not been subject to a direct CIR review. However, its individual botanical components have specific safety profiles: Melaleuca Alternifolia (Tea Tree) Leaf Extract (as Tea Tree Oil) is classified as a moderate skin sensitizer and, critically, by ECHA as a CMR substance category 1B (reproductive toxicity), rendering it unsuitable for use during pregnancy. The SCCS advises maximum concentrations for TTO, such as 0.1% in face cream. Rosmarinus Officinalis (Rosemary) Leaf Extract is deemed safe by the CIR Expert Panel at up to 0.2% in leave-on products when formulated to be non-sensitizing, and holds GRAS status by the FDA for food use. Thymus Vulgaris (Thyme) Leaf Extract is generally considered safe for cosmetic use at appropriate concentrations but carries a risk of irritation or allergic reactions in sensitive individuals if applied excessively.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

This blend is valuable for its potent antimicrobial, antioxidant, and anti-inflammatory effects, particularly benefiting oily and blemish-prone skin; however, the Melaleuca Alternifolia component's ECHA classification as a reproductive toxicant necessitates careful consideration and avoidance during pregnancy.

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