Semi Di Lino Density Thickening Shampoo and Conditioner 1 Litre Duo

All hair and skin types.

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

Oily scalps, heavy product users and people who like a strong cleanse.

May feel too cleansing for some dry, curly, colour-treated or sensitive hair types. This depends on the full formula and your hair needs.

Most hair types, including those wanting a gentler wash.

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

People looking for mild, low-foaming cleansers that are generally considered suitable for sensitive or dry hair types.

It is often used as an alternative to stronger surfactants to create a softer, more conditioning lather. It can also support formula stability and mildness in blended surfactant systems.

People who like a rich, stable lather in their cleansing products.

It is often used alongside primary surfactants to enhance texture and mildness. Its viscosity‑boosting effect can also improve the feel of rinse‑off formulas.

Those who like creamy, luxurious-feeling shampoo or conditioner textures.

It also provides a mild conditioning feel, helping formulas spread smoothly through the hair. Its use is common in many everyday cleansing products.

Those looking for softer, easier-to-detangle hair.

It is derived from guar gum and is commonly used to enhance conditioning in shampoos and conditioners. It can also reduce static and improve manageability.

Most hair types wanting smoother, easier-to-manage hair.

Widely used in shampoos and conditioners for slip and softness.

Hair wanting a light conditioning boost.

A plant-derived extract whose effect depends on the amount used.

People looking to support hair strength, smoothness or manageability, especially in damaged or colour-treated hair.

Hydrolysed proteins are broken into smaller fragments so they can more easily interact with the hair surface. They are commonly used to enhance feel and resilience without weighing the hair down.

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.

Most hair types, especially dry or dull hair.

A versatile, well-tolerated conditioning ingredient.

Dry or dehydrated hair, and many curl and moisture routines.

A very common, well-tolerated humectant used across countless products.

Those interested in how a product’s texture and lather are achieved.

It is a simple mineral salt that helps create a familiar shampoo feel and can influence how a cleanser spreads through the hair.

Most hair types as part of a balanced formula.

Usually present in small amounts to balance the formula.

All products, especially in hard-water areas.

Used in tiny amounts to keep formulas performing reliably.

All products that need a preservative system.

Often paired with other preservatives for broad protection.

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.

People who enjoy a scented product.

Fragrance preference is personal. Some people prefer fragrance-free formulas by choice.

Those who enjoy subtly scented haircare products.

It is one of the fragrance components that must be listed separately when present above certain levels. People with known fragrance sensitivities may choose to monitor for it.

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.

All hair and skin types.

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

People looking for smoother, more manageable hair or richer, creamier product textures.

Despite the name, fatty alcohols are moisturising and conditioning rather than drying. They also help stabilise and thicken many haircare formulas.

Most hair types, especially tangle-prone or coarse hair.

A common conditioner ingredient despite the chloride name, which simply describes its chemistry.

Those looking for conditioning, slip, or richer textures in their haircare products.

Despite the name, fatty alcohols like cetyl alcohol are non‑drying and are commonly used to add emollience and stability to formulations.

People looking to support hair strength, smoothness or manageability, especially in damaged or colour-treated hair.

Hydrolysed proteins are broken into smaller fragments so they can more easily interact with the hair surface. They are commonly used to enhance feel and resilience without weighing the hair down.

Hair wanting a light conditioning boost.

A plant-derived extract whose effect depends on the amount used.

Most hair types, especially dry or dull hair.

A versatile, well-tolerated conditioning ingredient.

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.

Damaged, frizz-prone or colour-treated hair wanting targeted smoothing.

Designed to deposit where hair needs it most. Some prefer silicone-free formulas by choice.

Those using products that need clear, stable formulations such as shampoos, serums or sprays.

It is commonly used in haircare as a non-ionic surfactant that improves product texture and clarity. It also supports even distribution of conditioning or fragrance ingredients.

People looking for improved manageability, detangling and smoother-feeling hair.

It is a commonly used quaternary ammonium compound that helps conditioners spread easily through the hair. It is effective even at low levels, which is why it appears frequently in rinse-off products.

Dry or dehydrated hair, and many curl and moisture routines.

A very common, well-tolerated humectant used across countless products.

Most hair types as part of a balanced formula.

Usually present in small amounts to balance the formula.

All products, especially in hard-water areas.

Used in tiny amounts to keep formulas performing reliably.

All products that need protecting from spoilage.

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

Those interested in gentle preservation systems or sensitive scalps may find it relevant.

It is often paired with other preservatives to improve their effectiveness while allowing for lower usage levels. It also has light moisturising and conditioning properties.

People who enjoy a scented product.

Fragrance preference is personal. Some people prefer fragrance-free formulas by choice.

Those who enjoy subtly scented haircare products.

It is one of the fragrance components that must be listed separately when present above certain levels. People with known fragrance sensitivities may choose to monitor for it.

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.