Head & Shoulders Classic Clean

Main solvent and base of the formula. It dissolves the cleansing agents and actives so the product can spread evenly through hair and scalp.

Very low concern in normal rinse-off use.

Also known as: Water

Primary cleansing surfactant. It removes oil, styling residue, and scalp buildup, so users get strong foam and a very clean feel.

Generally safe in rinse-off products, but it can be drying or irritating for some scalps, especially with frequent use or if the skin barrier is sensitive.

dry, sensitive, or eczema-prone scalps

Also known as: SLES

Strong secondary cleanser and foam booster. It increases detergency and helps remove heavy oil, but also makes the wash feel more stripping.

Can be irritating or drying, especially for sensitive scalps or damaged hair; this is a well-established concern.

sensitive scalps and very dry hair

Also known as: SLS

Thickens the shampoo and can help stabilize the surfactant system. Practically, it improves texture and pour behavior.

Low safety concern in this context, though it can contribute to dryness if the formula is already strongly cleansing.

very dry or brittle hair

Also known as: Salt

Milder co-surfactant that reduces harshness, improves foam, and helps the cleanser spread more evenly. It can make a sulfate system feel less stripping.

Generally safe, but it is a known trigger for some contact dermatitis cases, often related to impurities or individual sensitivity.

people with fragrance or surfactant sensitivity

Also known as: CAPB

Hydrotrope and solubilizing aid that helps keep surfactants and fragrance evenly mixed. In shampoo, it can also support cleansing and clarity of the formula.

Generally low concern in rinse-off use, though it may add to overall cleansing strength and therefore dryness in a strong detergent system.

very dry or sensitive scalps

Also known as: sodium xylene sulfonate

Pearlizing and opacifying agent that gives shampoo a creamy, pearly appearance. It can also add a slightly richer sensory feel.

Low concern in rinse-off products; it is mainly a texture/appearance ingredient rather than a biologically active one.

Buffers the formula to help keep pH in a useful range. That matters because pH affects scalp comfort, preservative performance, and how hair feels after washing.

Low concern in normal use.

Provides the product’s scent and masks raw material odors. It mainly affects user experience rather than hair performance.

Can trigger irritation or allergy in fragrance-sensitive users; exact composition is undisclosed, so individual tolerance varies.

fragrance-sensitive or allergy-prone users

Also known as: Fragrance

Anti-dandruff active that helps reduce Malassezia-related flaking and scalp scaling. In practice, it is the ingredient most likely to matter if the user is buying this for dandruff control.

Generally safe in rinse-off scalp products; mild irritation is possible in very sensitive users. Evidence for dandruff benefit is well-established for this use.

very sensitive scalps

Preservative that helps prevent microbial growth in the water-based formula. This protects both product safety and shelf life.

Generally safe at cosmetic use levels; occasional irritation can occur, especially on compromised skin.

very sensitive or broken scalp skin

Silicone conditioning polymer that smooths the hair surface, reduces friction, and improves shine. It can make hair feel softer and easier to detangle after washing.

Generally safe and low irritation risk, but it may build up on some hair types if used often, especially in a strong cleansing system that is not fully balancing it.

people who dislike silicone buildup

pH adjuster that helps bring the formula into a scalp- and hair-friendly range. A suitable pH can improve cuticle feel and reduce harshness.

Safe at cosmetic levels, though it can sting on irritated skin if the formula is acidic enough.

broken or very irritated scalp skin

Also known as: Vitamin C Acid

Can support scalp exfoliation and also contribute to preservation or buffering depending on the formula design. In an anti-dandruff shampoo, it may help with scalp flake management.

Generally safe in rinse-off use, but salicylate-sensitive users should be cautious; evidence for scalp benefit is more limited than for the main anti-dandruff active.

salicylate-sensitive users

Conditioning polymer that deposits on hair to reduce static, improve combing, and soften the feel after washing. It is especially useful in a strong cleanser because it helps reduce roughness.

Generally safe; occasional buildup or mild scalp sensitivity can occur, but this is uncommon in rinse-off products.

fine hair that gets weighed down

Also known as: Guar HTCl

Classic silicone conditioner that coats hair to reduce friction, improve shine, and make detangling easier. It is useful for damaged, frizzy, or color-treated hair that needs smoothing.

Generally safe and low irritation risk; the main practical issue is possible buildup or reduced volume for some hair types.

people avoiding silicones or prone to buildup

Also known as: Silicone

Fragrance component used to shape the scent profile. It does not improve hair performance directly.

Can cause fragrance allergy or irritation in sensitive users; this is a recognized EU fragrance allergen.

fragrance-allergic users

Also known as: hexyl cinnamaldehyde

Fragrance ingredient that contributes to the scent profile. It is mainly there for sensory appeal.

Can oxidize and become more allergenic over time; fragrance-sensitive users should be cautious. This is a well-established fragrance allergen.

fragrance-allergic users

Chelating agent that binds metal ions from water. This can improve foam, reduce dullness from hard water, and help preservatives work more effectively.

Generally safe in rinse-off cosmetics; low irritation potential at typical use levels.

Also known as: EDTA

Strong pH adjuster used in very small amounts to set the final formula pH. Proper pH is important for scalp comfort and product stability.

Safe when used correctly at cosmetic levels, but concentrated sodium hydroxide is highly caustic; the finished product should be non-irritating if properly formulated.

broken or highly sensitive skin if the formula is poorly balanced

Also known as: Lye

Anionic surfactant and solubilizing/cleansing aid. In a shampoo, it can strengthen cleansing and help the formula handle oily soil and fragrance components.

Generally safe in rinse-off use, but it can be irritating or drying in stronger detergent systems, especially for sensitive scalps.

dry or sensitive scalps

Also known as: triethanolamine dodecylbenzenesulfonate

Nonionic solubilizer and emulsifying aid that helps disperse oils, silicones, and fragrance in the formula. It supports product clarity and uniform performance.

Generally low concern in rinse-off products; irritation is uncommon at typical use levels.

Vitamin B3 derivative that can support scalp barrier function and comfort. In a shampoo, its practical benefit is usually modest because contact time is short, but it may still be useful for scalp-focused formulas.

Generally safe and well tolerated; occasional flushing or irritation is possible in very sensitive users, though less common in rinse-off products.

very sensitive scalps

Also known as: Vitamin B3

Humectant and conditioning active that helps hair retain moisture and feel softer. It can improve manageability and reduce the dry feel from strong cleansers.

Generally safe and well tolerated; irritation is uncommon.

Also known as: Provitamin B5

Vitamin E derivative used as an antioxidant support ingredient. It may help protect the formula’s oils and add a small scalp-care benefit, though rinse-off impact is usually limited.

Generally safe; true allergy is uncommon but possible.

Also known as: Vitamin E (stable ester)

Preservative and fragrance component that helps protect the formula from microbial growth. It can also contribute a mild scent note.

Generally safe at cosmetic levels, but it is a recognized fragrance allergen and can sting sensitive or broken skin.

fragrance-sensitive or irritated scalps

Solvent and humectant-like carrier that can help dissolve ingredients and improve formula handling. In hair products, it mainly supports the base rather than acting as a standout treatment ingredient.

Generally low concern in rinse-off use; irritation is uncommon at typical cosmetic levels.

Also known as: triethylene glycol

Humectant and solvent that helps retain water and dissolve certain ingredients. In this formula it likely supports texture, preservation, and delivery of actives.

Generally safe, but it can irritate very sensitive skin in some people; this is a known but not common issue.

very sensitive scalps

Also known as: 1,2-Propanediol

Blue colorant used to give the product its final appearance. It does not affect cleansing or conditioning performance.

Low concern in normal cosmetic use.

Red colorant used to adjust the product’s shade. It is included for visual appeal rather than hair benefit.

Low concern in normal cosmetic use.

Also known as: D&C Red 33