Tea Tree Oil

Tea Tree Oil

Tea Tree Oil is a volatile essential oil obtained from the leaves of the tea tree, Melaleuca alternifolia, which is native to Australia. Cosmetic-grade Tea Tree Oil is produced through steam distillation, a physical extraction process that isolates the oil’s naturally occurring aromatic compounds without chemical modification. The oil is characterized by a complex profile of terpene compounds, with terpinen-4-ol being a key constituent that defines much of its functional behavior and scent profile. The production process does not involve ethoxylation, sulfation, or petrochemical modification, supporting its use inclean and traditionally derived cosmetic formulations.

From a formulation standpoint, Tea Tree Oil functions primarily as a fragrance component and sensory modifier, with additional supportive roles in certain topical applications due to its aromatic composition. It is typically used at low concentrations and incorporated into the oil phase or properly solubilized for water-based systems. Its performance is influenced by concentration, solubilization method, overall fragrance load, and final product pH, particularly in rinse-off formulations.

In finished products, Tea Tree Oil delivers a fresh, medicinal, and clarifying aromatic profile that is commonly associated with cleansing and purifying products. At low usage levels, it provides a subtle aromatic effect and sensory freshness, while higher levels create a more pronounced scent experience. It is widely used in facial cleansers, shampoos, body washes, scalp treatments, spot treatments, soaps, and aromatherapy-inspired products. Because of its potency, careful formulation is required, especially in leave-on products intended for frequent use.

From a clean standards and safety perspective, Tea Tree Oil has a long history of cosmetic and topical use and is broadly accepted within global regulatory frameworks when used within established cosmetic limits. It is biodegradable and plant-derived, but due to its concentrated aromatic components, it may cause irritation or sensitization if overused. Responsible formulation practices, including conservative usage levels and adherence to fragrance guidelines, are essential. Its functional and sensory profile supports inclusion in ingredient offerings carefully selected by Suncoast PCP for controlled cosmetic formulation use.

Suncoast PCP carefully selects Tea Tree Oil based on aromatic quality, purity, and consistency, ensuring reliable performance in cleansing-focused and specialty cosmetic applications while aligning with clean and modern formulation standards.

Ingredient Identification

INCI Name: Melaleuca Alternifolia (Tea Tree) Leaf Oil
CAS Number: 68647-73-4

Physical & Technical Properties

Appearance: Clear to pale yellow liquid
Odor: Strong, fresh, medicinal, characteristic
Solubility: Insoluble in water; soluble in oils and organic solvents
Volatility: Moderate to high
Functional Role: Fragrance ingredient, sensory modifier

Typical Usage Levels (Cosmetic Applications)

Rinse-Off Products: 0.1–1.0%
Leave-On Products: 0.01–0.5%
Shampoos and Scalp Products: 0.1–1.0%
Spot Treatments: 0.01–0.3%

Actual usage levels should align with fragrance guidelines, skin tolerance considerations, and product type.

DIY Education and Formulation Guidance

For DIY formulators, Tea Tree Oil should be handled with care due to its strong aroma and active profile. It is typically added during the cool-down phase to minimize volatilization and scent loss. Accurate weighing and conservative dosing are strongly recommended, particularly for leave-on formulations.

In water-based systems, Tea Tree Oil must be properly solubilized to ensure uniform dispersion and prevent separation. Patch testing is advised when formulating products intended for sensitive or compromised skin.

Formulation Compatibility & Common Combinations

Tea Tree Oil is compatible with carrier oils, waxes, butters, surfactants, and fragrance-compatible emulsifier systems. It blends well with essential oils such as lavender, eucalyptus, rosemary, and peppermint to create balanced aromatic profiles. In emulsions, it is typically incorporated into the oil phase or pre-blended fragrance component.

Shelf Life, Storage, and Packaging

Shelf Life: Typically 24–36 months under recommended storage conditions
Storage Conditions: Store in a cool, dark environment away from heat and light
Packaging Recommendations: Amber glass bottles or aluminum containers with tight closures
Handling Notes: Minimize air exposure to reduce oxidation and aroma degradation

Regulatory & Safety Notes

Regulatory Status: Approved for cosmetic use globally when used in accordance with applicable fragrance guidelines
California Proposition 65: Not listed
EWG Context: Generally categorized as moderate hazard due to irritation potential at higher concentrations
Irritation and Sensitization: May cause irritation or sensitization if overused; appropriate dilution required
Clean Beauty Compatibility: Plant-derived and biodegradable; suitable for clean and natural-leaning formulations when responsibly formulated