Scalp Care + Hair Thickening Leave On Treatment (System 4) - 100ml

All hair and skin types.

Almost always the first ingredient listed in water-based products.

Those looking to support scalp comfort, strengthen hair, or maintain a healthy-looking scalp barrier.

It is commonly used in both skincare and haircare for its soothing and barrier-supporting properties. It pairs well with many other ingredients and is generally well tolerated.

People interested in scalp-focused formulas or products aimed at maintaining the appearance of fuller, energised hair.

It is often included in shampoos, tonics and leave‑ins to complement other scalp-care ingredients. Its effects are generally most noticeable when used consistently.

Those using products with essential oils or fragranced blends, as it helps disperse these evenly.

It is widely used as a gentle solubiliser in both leave‑in and rinse‑off products. Its presence can improve product consistency and prevent ingredient separation.

People looking to maintain colour-treated hair or reduce UV impact on hair and scalp.

It is often used to help stabilise formulas that may be exposed to sunlight. Its presence can support the longevity of colour care products.

All products that need protecting from spoilage.

A very common, well-studied preservative used at low levels.

All products that need a preservative system.

Often paired with other preservatives for broad protection.

People looking for smoother, easier-to-detangle hair without a heavy silicone feel.

Because it is water-dispersible, it tends to rinse out more easily than many traditional silicones. It is commonly used in both rinse-off and leave-in formulas for added manageability.

Those interested in understanding preservative systems or identifying potential fragrance allergens.

Benzyl Alcohol is commonly used in professional haircare to support product stability and texture. It can also naturally occur in some essential oils.

Those interested in how product pH affects scalp comfort or hair cuticle behaviour.

It is used in very small amounts to bring a formula to the desired pH range. Once adjusted, it does not act as a strong alkaline agent in the finished product.

Most hair types, including those wanting a gentler wash.

Often paired with other surfactants to make a formula feel milder.

Those with dry or dehydrated hair seeking smoother, more manageable texture.

It is commonly used to improve hair softness and maintain moisture balance in formulations. It can also support the spreadability and feel of leave‑in and rinse‑off products.

Those in hard-water areas who want shampoos and conditioners to rinse more cleanly.

Chelating agents can support formula consistency and help prevent minerals from depositing on the hair or interfering with product texture. They are widely used in many rinse-off and leave-in formulations.

Most hair types as part of a moisturising formula.

A widely used humectant and carrier ingredient.

People using stimulating or energising scalp products aiming to support a refreshed sensation.

It is often included at low levels in targeted scalp treatments to create a warming effect. This tingling sensation is normal and is linked to its circulation-boosting activity.

Those who enjoy refreshing, minty sensations or products designed to invigorate the scalp.

It is commonly used in haircare for its characteristic aroma and cooling effect. Essential oils are typically included at low levels to support sensory benefits.

Those using products with essential oils or oil-based actives that need even distribution.

It is widely used to keep formulations consistent and prevent separation. In haircare, it can also support the even spread of conditioning or fragrance oils.

Those using creams or conditioners that rely on smooth, even textures.

It is widely used in haircare to ensure consistent texture and to help disperse ingredients evenly. It also offers mild surfactant properties that support product spreadability.

People who prefer products with a smooth, gel-like texture or enhanced slip during application.

It helps improve product consistency and spreadability without adding heaviness to the formula. It is widely used because it remains stable and blends well with many other ingredients.

Those who enjoy invigorating, minty formulas or products designed to refresh the scalp.

Peppermint oil is commonly used in small amounts for its sensory benefits and perceived scalp‑refreshing qualities. As with many essential oils, sensitivity varies between individuals.

A fragrance component that must be listed separately on labels because a minority of people can be sensitive to it. Its presence is normal, required disclosure and is not a quality signal.

Those interested in soothing or antioxidant-rich botanical ingredients.

It is commonly used in haircare for its calming and conditioning properties. Its gentle nature makes it suitable for a wide range of formulations.

Those looking for support with hair strength, manageability or damage care.

This ingredient combines a cystine derivative with a silane structure to help improve hair feel and resilience. It is commonly used in modern strengthening and smoothing formulas.

Those seeking added softness, moisture support or smoother-feeling hair.

It is a phospholipid commonly derived from soy or sunflower and is valued for its ability to enhance spreadability and moisture retention. It can also help stabilise certain formulations.

Those looking for added conditioning support or antioxidant benefits in their haircare.

It is commonly used because it is more stable than pure vitamin E while still offering similar benefits. It appears in many leave-in and rinse-off formulations.

Those looking for formulas that help maintain a healthy-feeling scalp or the appearance of stronger hair.

In topical products it is used in small amounts to complement other strengthening or scalp-care ingredients. Its effects are supportive rather than dramatic on its own.

People who prefer plant-derived ingredients, those seeking natural fragrances or antioxidant-rich extracts, and users interested in scalp-supporting botanicals.

Composition and activity vary with plant source and extraction method, so effects depend on concentration and formulation. As with many botanicals, some individuals may experience sensitivity or allergic reactions.

Fennel fruit extracts contain components such as anethole, fenchone, flavonoids and other phenolic compounds; small amounts of volatile oils can contribute to scent. In cosmetics they are commonly used for fragrance, antioxidant activity and as a supportive scalp/conditioning ingredient rather than as a primary treatment. Formulators select an extract type (aqueous, hydroalcoholic or essential oil fraction) based on the desired functional and sensory properties.

Those using styling or dry-finish products that benefit from a lightweight, matte feel.

It is a common mineral ingredient used to enhance spreadability and stabilise product textures. It appears in a wide range of hair and styling products for its versatility.

Those looking for botanical ingredients that can help invigorate the scalp or brighten the hair’s appearance.

Lemon peel extract is often included for its refreshing scent and natural antioxidant content. Its benefits can vary depending on the formulation and concentration.

Those looking for gentle botanical ingredients that support moisture retention.

Sugar cane extract is commonly used in haircare for its natural humectant properties and is compatible with most formulations. It may also support overall softness and shine.

Those looking for plant-derived ingredients that can help maintain hydration in hair and scalp.

Sugar maple extract is often included with other botanical ingredients to boost conditioning formulas. It is typically used at low levels alongside humectants and emollients.

Those looking for gentle, plant-derived ingredients that support scalp comfort and overall hair conditioning.

Botanical extracts like this one are commonly added to enhance the sensory and supportive qualities of haircare formulas. Their benefits can vary depending on concentration and the overall product type.

Most hair types as part of a balanced formula.

Usually present in small amounts to balance the formula.

Those looking for gentle, nutrient-rich plant-derived extracts in their haircare.

It contains naturally occurring amino acids and polysaccharides that can support hydration and scalp comfort. It is widely used in both hair and skin formulations.

Anyone using products that benefit from a long, reliable shelf life.

Propylparaben is a widely used preservative that helps maintain product quality and freshness. It is used at very low levels and is well studied for its role in keeping formulations stable.

Those who enjoy botanically inspired formulas or lightweight, refreshing additions to cleansing and conditioning products.

Orange fruit extract is commonly included for its natural sugars, mild acids and antioxidant content. It is typically used in low levels to complement the broader formula.

People seeking lightweight hydration or improved hold in styling products.

It is a carbohydrate derived from starch and is commonly used to support texture and moisture balance in formulations.

Anyone who wants products to stay fresh and stable over time.

Parabens like methylparaben are widely used because they are effective in very small amounts and have a long history of use in cosmetics. They help maintain product quality, especially in water-based formulas.

Anyone who uses water-based products that benefit from reliable preservation.

It is commonly used alongside other preservation systems to maintain product freshness and extend shelf life. It is generally well tolerated in rinse-off and leave-in products.

Those who want products with reliable preservation, including professionals who need consistent shelf stability.

Ethylparaben is part of the paraben family, which has been widely used for many years due to its effectiveness in small amounts. It is often combined with other preservatives to create a broad‑spectrum system.

Those who want products with a longer shelf life and consistent performance.

Parabens like butylparaben are widely used and well-studied preservatives that help keep products stable. They are typically present in very small amounts to maintain freshness and quality.

Anyone using products that benefit from extended shelf life and maintained performance.

It helps protect oils and other sensitive ingredients from breaking down when exposed to air and light. It is used in very small amounts to support product consistency.