The Natural Spa Rosemary & Tea Tree Eco Shampoo Bar is a syndet (synthetic detergent) shampoo bar — not a traditional saponified soap formulation. The base is pH-balanced to approximately 4.5 and works in all hair types, including in hard water. Scented with rosemary and tea tree essential oils. Available in mini (15g) and full size — select from the product dropdown.
Why you'll like it
- Syndet base (not soap) — pH approximately 4.5, compatible with all hair types
- Works in hard water — no mineral build-up or requirement for vinegar rinse
- Rosemary and tea tree essential oils — herbal scent profile
- Panthenol and Phytokeratin blend — hydrolyzed soy, corn, and wheat proteins
- Vegan-friendly and cruelty-free
- Plastic-free packaging
- Mini (15g) and full size available — select from dropdown
Designed as
The Eco Shampoo Bar range from The Natural Spa uses a syndet base — the primary cleansing agent is Sodium Cocoyl Isethionate rather than saponified oils. Unlike traditional cold-process soap bars (pH 9–10), syndet bars are pH-balanced to approximately 4.5, produce a creamy lather without depositing mineral residue in hard water, and do not require a vinegar rinse to close the hair cuticle. The formula also contains Panthenol (provitamin B5) and a Phytokeratin blend (hydrolyzed soy, corn, and wheat proteins). Note: contains hydrolyzed wheat protein — consult a healthcare professional before use if you have wheat or gluten sensitivity. Scented with rosemary and tea tree essential oils.
Key features
- Brand: The Natural Spa
- Type: Eco syndet shampoo bar (not soap)
- Scent: Rosemary and tea tree essential oils
- Base: Syndet (Sodium Cocoyl Isethionate)
- pH: Approximately 4.5
- Key additions: Panthenol, Phytokeratin (hydrolyzed soy, corn, wheat proteins)
- Packaging: Plastic-free
- Format: Mini (15g) and full size — select from dropdown
- Vegan-friendly, cruelty-free
- Country of manufacture: UK (Devon)
Best for
Anyone switching from liquid shampoo to a solid bar format, or those who have found traditional soap-based shampoo bars unsuitable due to hard water. Not suitable for anyone with wheat or gluten sensitivity — contains hydrolyzed wheat protein (in Phytokeratin). Solid bar format is not subject to carry-on liquid volume restrictions. Not a medical product. Curated by Aetheo — sourced from The Natural Spa and tested against our quality standards before reaching the store.
What's included
1 x Rosemary & Tea Tree Eco Shampoo Bar (mini or full size, as selected).
Curated by Aetheo
Curated by Aetheo — sourced from The Natural Spa and tested against our quality standards before reaching the store.
What is the difference between a syndet bar and a soap-based shampoo bar?
A syndet bar uses synthetic surfactants as the cleansing base rather than saponified oils. In this bar, the primary surfactant is Sodium Cocoyl Isethionate. The key practical differences: syndet bars have a pH of approximately 4.5 (versus 9–10 for cold-process soap), they do not deposit the same mineral residue in hard water, and they do not require a vinegar or apple cider vinegar rinse to close the hair cuticle. The lather profile is also closer to that of a liquid shampoo. Traditional soap bars and syndet bars are not the same product category.
Does it contain gluten or wheat?
Yes. The formula includes Phytokeratin, which contains Hydrolyzed Wheat Protein as one of its components — alongside Hydrolyzed Soy Protein and Hydrolyzed Corn Protein. Individuals with wheat sensitivity or coeliac disease should consult a healthcare professional before use.
What fragrance allergens does it contain?
The following fragrance allergens are present, naturally occurring in the essential oil blend: Limonene, Citral, Linalool, Coumarin, Eugenol, Geraniol, Citronellol. Declared in compliance with UK/EU cosmetics regulations.
Full ingredients (INCI)
Sodium Cocoyl Isethionate, Cetyl Alcohol, Behentrimonium Methosulfate, Cocamidopropyl Betaine, Aqua, Panthenol, Citric Acid, Cocos Nucifera Oil, Theobroma Cacao Seed Butter, Argania Spinosa Kernel Oil, Olea Europaea Fruit Oil, Simmondsia Chinensis Seed Oil, Stearic Acid, Phytokeratin (Aqua, Hydrolyzed Soy Protein, Hydrolyzed Corn Protein, Hydrolyzed Wheat Protein, Phenoxyethanol), Parfum (essential oils), Kaolin, Limonene, Citral, Linalool, Coumarin, Eugenol, Geraniol, Citronellol
