Biolage Hydrasource Duo Pack

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.

Oily scalps and routines that need a strong, clarifying wash.

Can be more cleansing than gentler surfactants. Many people use it happily, while others prefer milder options for everyday washing.

Most hair types, including those wanting a gentler wash.

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

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.

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 using stylers, treatments or serums that rely on smooth, even application.

It is commonly used in both leave-in and rinse-off products to support stable, easy-to-apply textures. It can also assist with product absorption and consistency.

All products that need a preservative system.

Often paired with other preservatives for broad protection.

People dealing with flaky scalps, congestion or product buildup.

It is widely used in scalp-care formulas because it breaks down excess oils and debris without needing physical scrubbing. Often found in dandruff-control products.

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.

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 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.

Those who enjoy subtly sweet, complex fragrance profiles in their haircare products.

It is one of the fragrance components that must be listed individually when present above certain levels, as some people may prefer to monitor specific scent materials. Its presence does not indicate the overall strength of a product's fragrance.

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 who enjoy distinctly floral-scented products.

It is a recognised fragrance allergen, so people with known fragrance sensitivities may prefer to patch test. Regulations and usage vary by region, and it may be phased out in some markets.

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 who enjoy scented hair products or want a light floral note in their routine.

It is one of the fragrance allergens that must be listed on labels when present above certain thresholds. People who are monitoring fragrance components for sensitivity may find this information useful.

Most hair types as part of a balanced formula.

Usually present in small amounts to balance the formula.

Those who enjoy lightly floral-scented haircare products.

It is one of the fragrance allergens that must be listed on labels when present above certain thresholds. Its presence does not indicate product quality, but can help those monitoring specific fragrance components.

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.

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

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

People looking for smoother, easier-to-comb hair, especially in conditioners and leave-in products.

Despite the name, it is not a strong sulphate cleanser but a gentle, oil-loving conditioning compound derived from fatty alcohols.

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.

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

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

All products that need protecting from spoilage.

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

Most hair types as part of a balanced formula.

Usually present in small amounts to balance the formula.

Those using styling products that benefit from fast evaporation, such as sprays.

It is commonly used at low levels to improve texture and spreadability. It evaporates quickly, leaving minimal residue on the hair.

Most hair and scalp types, including those wanting a gentle feel.

A popular botanical used across many gentle and moisturising products.

Those using products with oils or silicones who want them to rinse evenly without residue.

It is commonly used in shampoos and styling products to support stable, uniform textures. Its mild nature makes it suitable for a wide range of formulations.

Most hair types as part of a moisturising formula.

A widely used humectant and carrier ingredient.

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.

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.

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.

Those with dry, dehydrated or coarse hair seeking added softness and moisture retention.

It is the salt form of hyaluronic acid and is widely used because it can hold many times its weight in water. In haircare, it helps support smoother, more manageable strands without adding heaviness.

Those who enjoy subtly sweet, complex fragrance profiles in their haircare products.

It is one of the fragrance components that must be listed individually when present above certain levels, as some people may prefer to monitor specific scent materials. Its presence does not indicate the overall strength of a product's fragrance.

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.

People using products that need clear, stable formulas such as serums, sprays or lightweight conditioners.

It is a commonly used solubilising agent that supports smooth texture and consistency in formulations. It also helps cleanse by lifting light oils and impurities.

Those with a sensitive or easily irritated scalp may appreciate its calming properties.

It is commonly derived from chamomile or produced synthetically with similar benefits. It is widely used in both skincare and haircare for its gentle, comforting profile.

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.

All products that need a preservative system.

Often paired with other preservatives for broad protection.