Amazon Basics Tea Tree Oil Shampoo for Hair, with Peppermint

This is an invigorating, clarifying tea tree shampoo formulated with robust sulfate cleansers, cooling menthol, and soothing botanical extracts to deeply purify the scalp and hair.

Performance Rating: 7.8

This shampoo demonstrates strong functional performance thanks to an effective blend of primary and secondary surfactants, including Sodium Laureth Sulfate, Sodium Lauryl Sulfate, and Cocamidopropyl Betaine, which create a rich lather and deliver thorough, deep cleansing. Hair conditioning and detangling are effectively supported by Polyquaternium-7, Panthenol, and targeted silicones like Bisamino PEG/PPG-41/3 Aminoethyl PG-Propyl Dimethicone, helping smooth the cuticle and reduce friction. Additionally, menthol, tea tree leaf oil, and peppermint oil provide an invigorating sensory feel while botanical extracts such as aloe, chamomile, and rosemary contribute to a balanced, manageable hair finish.

Safety Rating: 5.9

The safety profile is constrained by several ingredients with known potential for irritation and sensitization. The combination of Sodium Lauryl Sulfate and Sodium Laureth Sulfate can strip natural lipids and cause scalp dryness. More significantly, the preservative system relies on Methylchloroisothiazolinone and Methylisothiazolinone, both recognized as potent contact allergens. The presence of synthetic fragrance, concentrated essential oils like peppermint and tea tree oil, and artificial colorants (Blue 1 and Yellow 5) introduces additional risks of contact dermatitis and allergic reactions, particularly for individuals with reactive or sensitive scalp conditions.

Final Rating: 6.9

Overall, the formula represents a solid compromise between high cleansing efficacy and moderate ingredient safety. It excels at removing buildup, providing an invigorating scalp sensation, and delivering smooth, manageable strands through conditioning polymers and silicones. However, its widespread appeal is tempered by the inclusion of harsh sulfate surfactants and sensitizing isothiazolinone preservatives, which may not be suitable for frequent use on dry, color-treated, or highly sensitive skin. Consequently, it stands as a reliable, high-foaming clarifying option suited best for normal to oily hair types seeking refreshing, deep-cleaning results.

Verdict

This formula delivers a high-foaming, deeply clarifying cleanse driven by a potent surfactant blend of sodium laureth sulfate, sodium lauryl sulfate, and cocamidopropyl betaine. These primary cleansers work synergistically to break down heavy sebum, stubborn styling product residue, and environmental buildup. While this level of cleansing strength is exceptionally effective for resetting an oily or congested scalp, it is inherently potent. The inclusion of cocamide MIPA further stabilizes the rich lather, ensuring a thorough wash from roots to ends.

To balance the high-cleansing action, the shampoo incorporates a cooling sensory cocktail of tea tree leaf oil, peppermint oil, and menthol. These ingredients provide a signature refreshing tingle, actively stimulating microcirculation and offering natural antimicrobial benefits that help keep dandruff flakes and scalp irritation in check. Complementary botanical ingredients like aloe barbadensis leaf juice, chamomile flower extract, and rosemary leaf extract provide lightweight soothing properties, while wheat germ oil contributes trace nourishing lipids to soften the hair cuticles during the wash.

Conditioning and detangling performance are supported by panthenol, polyquaternium-7, and modified silicones including PEG-12 dimethicone and bisamino PEG/PPG-41/3 aminoethyl PG-propyl dimethicone. These water-soluble and amino-functional conditioning agents coat the hair fiber, imparting slip, manageability, and shine without creating heavy, greasy weight. Humectants like glycerin and propylene glycol assist in drawing moisture into the hair strand, mitigating the immediate moisture loss commonly associated with strong, dual-sulfate cleansing systems.

Overall, this shampoo is a classic, salon-grade purifying and stimulating cleanser best suited for normal to excessively oily hair types. However, because it contains traditional sulfates, added fragrance, and strong preservatives like methylisothiazolinone, it may be overly stripping for severely parched, bleached, or fragile curly hair. For individuals seeking a weekly clarifying reset or a daily clarifying wash for an active lifestyle, this formula provides an unmatched clean, energized scalp sensation.

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Ingredient Evaluation

📁 Surfactants / 表面活性剂

🧪 Sodium Laureth Sulfate / 月桂醇聚醚硫酸酯钠

Purpose: Primary cleansing agent and foaming agent that removes dirt and excess sebum.

Concerns: May cause dryness or mild scalp irritation in sensitive individuals, though it is milder than Sodium Lauryl Sulfate.

Notes: An ethoxylated anionic surfactant widely used in hair care to produce rich, stable lather.

🧪 Sodium Lauryl Sulfate / 月桂醇硫酸酯钠

Purpose: Strong cleansing and foaming surfactant that lifts grease and buildup.

Concerns: Higher potential for skin and scalp irritation, dryness, or stripping natural oils compared to gentler alternatives.

Notes: A primary anionic surfactant renowned for high detergency and voluminous foam.

🧪 Cocamidopropyl Betaine / 椰油酰胺丙基甜菜碱

Purpose: Secondary surfactant and foam booster that mitigates the harshness of sulfate surfactants.

Concerns: May contain trace impurities from synthesis (such as DMAPA) that can cause contact allergies in sensitive individuals.

Notes: An amphoteric surfactant derived from coconut fatty acids that enhances mildness and increases viscosity.

🧪 Cocamide MIPA / 椰油酰胺 MIPA

Purpose: Non-ionic foam booster and viscosity builder that stabilizes lather.

Notes: Often used as a safer alternative to Cocamide DEA to achieve similar thickening and foam-stabilizing performance without nitrosamine concerns.

📁 Solvents / 溶剂与保湿成分

🧪 Water / 水

Purpose: Acts as the primary solvent and vehicle for dissolving all other ingredients in the formula.

Notes: Deionized or purified water typically forms 70% to 85% of standard liquid shampoo formulations.

🧪 Propylene Glycol / 丙二醇

Purpose: Functions as a solvent, penetration enhancer, and humectant.

Concerns: Can cause mild contact irritation in high concentrations on broken or highly sensitive skin.

Notes: Helps maintain product clarity and prevents formula freeze-thaw instability.

🧪 Glycerin / 甘油

Purpose: Draws moisture from the environment into the scalp and hair cuticle as a humectant.

Notes: One of the most cost-effective and classic biomimetic moisturizing agents.

🧪 Panthenol / 泛醇

Purpose: Acts as provitamin B5, penetrating hair shafts to provide deep hydration and improve hair elasticity.

Notes: Readily converts into pantothenic acid in the body and helps soothe irritated scalp conditions.

📁 Conditioning Agents / 调理剂

🧪 Polyquaternium-7 / 聚季铵盐-7

Purpose: Cationic conditioning polymer that reduces static, improves wet combability, and adds slip.

Notes: Binds electrostatically to negatively charged, damaged hair shafts to smooth cuticles.

🧪 Bisamino PEG/PPG-41/3 Aminoethyl PG-Propyl Dimethicone / 双氨基 PEG/PPG-41/3 氨乙基 PG-丙基聚二甲基硅氧烷

Purpose: Specialized amodimethicone derivative that selectively conditions damaged hair areas.

Notes: Offers water-dispersible characteristics that reduce the heavy buildup associated with traditional silicone oils.

🧪 PEG-12 Dimethicone / PEG-12 聚二甲基硅氧烷

Purpose: Water-soluble silicone surfactant that provides lubrication, shine, and silky texture without weighing hair down.

Notes: Easily washed out due to its ethoxylated hydrophilic modification.

🧪 Triticum Vulgare (Wheat) Germ Oil / 小麦胚芽油

Purpose: Emollient and nutrient-rich plant oil that conditions dry strands and replenishes lipids.

Notes: Naturally high in vitamin E, linoleic acid, and lecithin, offering antioxidant protection to hair fibers.

📁 Active Ingredients / 活性成分(清凉与精油)

🧪 Menthol / 薄荷醇

Purpose: Provides a cooling sensation on the scalp, stimulates microcirculation, and relieves itchiness.

Concerns: May cause tingling or mild irritation around broken skin or sensitive eyes.

Notes: Triggers cold-sensitive TRPM8 receptors to deliver a refreshing sensory cue.

🧪 Melaleuca Alternifolia (Tea Tree) Leaf Oil / 互生叶白千层叶油

Purpose: Provides natural antimicrobial, clarifying, and anti-dandruff benefits.

Concerns: Essential oils can be potential contact sensitizers for allergy-prone individuals.

Notes: Rich in terpinen-4-ol, effective against Malassezia yeast associated with scalp flaking.

🧪 Mentha Piperita (Peppermint) Oil / 辣薄荷油

Purpose: Imparts an invigorating aroma, stimulates the scalp, and adds a refreshing feel.

Concerns: May trigger contact allergies or eye irritation if used at high concentrations.

Notes: Works synergistically with menthol and tea tree oil for scalp clarity and odor control.

🧪 Aloe Barbadensis Leaf Juice / 库拉索芦荟叶汁

Purpose: Delivers soothing, anti-inflammatory, and hydrating benefits to the scalp.

Notes: Contains polysaccharides, amino acids, and minerals that help calm irritated skin.

🧪 Rosmarinus Officinalis (Rosemary) Leaf Extract / 迷迭香叶提取物

Purpose: Provides antioxidant properties, supports scalp circulation, and helps maintain hair vitality.

Notes: Rich in rosmarinic acid and carnosic acid, well known for scalp-revitalizing properties.

📁 Active Ingredients / 活性成分(植物提取物)

🧪 Anthemis Nobilis Flower Extract / 白花春黄菊花提取物

Purpose: Soothes irritated scalp conditions and delivers anti-inflammatory benefits.

Notes: Commonly known as Roman Chamomile, celebrated for gentle and calming properties.

🧪 Chamomilla Recutita (Matricaria) Flower Extract / 母菊花提取物

Purpose: Calms sensitive scalp tissue and provides natural soothing flavonoids.

Notes: Contains bisabolol and chamazulene, often used in anti-irritation formulations.

🧪 Hedychium Coronarium Root Extract / 白姜花根提取物

Purpose: Botanical extract (Hawaiian white ginger / Awapuhi) that enhances hair shine and provides moisture.

Notes: Traditionally used in Pacific hair rituals for its conditioning and luster-boosting qualities.

🧪 Fucus Vesiculosus Extract / 墨角藻提取物

Purpose: Seaweed extract that supplies trace minerals and hydration to the scalp and hair cuticle.

Notes: Rich in fucoidan and alginic acid, which form a protective moisture-retaining film.

📁 Thickeners / 增稠剂与质感调节剂

🧪 Glycol Stearate / 乙二醇硬脂酸酯

Purpose: Opacifying and pearlescing agent that gives the shampoo an attractive pearlescent look and adds body.

Notes: Also acts as a secondary emollient in cleansing formulations.

🧪 PEG-150 Distearate / PEG-150 二硬脂酸酯

Purpose: Non-ionic polymeric thickener that effectively builds viscosity in surfactant solutions.

Notes: Particularly effective in sulfate-based systems to achieve a rich, luxurious product flow.

🧪 Sodium Chloride / 氯化钠

Purpose: Viscosity adjuster that works with anionic and amphoteric surfactants to thicken the formula.

Notes: Common salt that increases surfactant micelle packing density to build gel-like consistency.

🧪 Citric Acid / 柠檬酸

Purpose: pH adjuster used to buffer the shampoo to an acidic pH (typically 5.0–6.0), closing hair cuticles.

Notes: Derived organically; helps preserve hair shaft smoothness and product stability.

📁 Preservatives / 防腐剂与螯合剂

🧪 Methylchloroisothiazolinone / 甲基氯异噻唑啉酮

Purpose: Broad-spectrum preservative active against bacteria, yeast, and mold.

Concerns: Known potential contact allergen; restricted strictly to rinse-off products at regulated low ppm levels.

Notes: Commonly paired with Methylisothiazolinone in a standardized 3:1 mixture (Kathon CG).

🧪 Methylisothiazolinone / 甲基异噻唑啉酮

Purpose: Broad-spectrum synthetic antimicrobial preservative for aqueous systems.

Concerns: Can cause skin sensitization and contact dermatitis in sensitized individuals.

Notes: Regulatory agencies strictly ban its use in leave-on cosmetic products, permitting it only in rinse-off formats.

🧪 Tetrasodium EDTA / EDTA 四钠

Purpose: Chelating agent that sequesters heavy metal ions present in tap water to boost preservative efficacy and prevent foam suppression.

Notes: Helps prevent rancidity and discoloration caused by trace mineral oxidation.

📁 Fragrance / 香精与着色剂

🧪 Fragrance / 香精

Purpose: Imparts a pleasant aroma to mask base surfactant odors and enhance user experience.

Concerns: Proprietary fragrance blends can contain allergens that trigger reactions in sensitive skin.

Notes: Subject to IFRA safety standards and concentration restrictions.

🧪 Blue 1 / CI 42090(亮蓝)

Purpose: Synthetic water-soluble dye added to give the shampoo an appealing green or blue hue.

Notes: Also listed under Color Index as CI 42090; widely approved for cosmetic rinse-off use.

🧪 Yellow 5 / CI 19140(柠檬黄)

Purpose: Synthetic colorant used alongside Blue 1 to create the distinctive tea-tree green appearance.

Notes: Also known as Tartrazine or CI 19140; approved for food, drug, and cosmetic use.