Anti-Dandruff Actives and Scalp Treatment Formulation

The permitted actives differ by market and several have been restricted. Here is how each one works, what the surfactant base has to do, and where the claim boundary sits.

Anti-Dandruff and Scalp Treatment Actives

Anti-dandruff is the most regulated part of hair care and the part where claim language is most tightly constrained. The permitted actives differ between markets, several well known ingredients are restricted or unavailable in particular regions, and the boundary between a cosmetic that reduces visible flaking and a medicinal product that treats a condition is drawn differently from place to place.

The Actives and How They Work

Zinc pyrithione. Long the reference active, effective against the yeast associated with flaking. Its regulatory status has changed in several jurisdictions including the European Union, where it is no longer permitted in cosmetics, so a formula built around it cannot be sold everywhere. Confirm the status in each destination market before committing.
Piroctone olamine. The most widely used alternative and the practical replacement in markets where zinc pyrithione is restricted. Effective at 0.5 to 1.0 per cent, it is compatible with most surfactant systems and has no significant colour or odour impact.
Climbazole. Effective and permitted in the European Union at defined limits. Slightly more difficult to solubilise than piroctone olamine and can affect the viscosity of a surfactant base.
Selenium disulphide. Effective and regulated with a maximum permitted concentration in most markets. It has a distinct odour, can discolour hair and metal, and is more common in treatment products than in everyday shampoo.
Salicylic acid. Used for its effect on scale rather than on the organism. Its permitted level in rinse-off products differs from leave-on, so the concentration has to be checked against the product type and the market.
Coal tar and sulphur. Historically used, unpleasant to formulate and to use, and restricted in many markets.
Non-medicated routes. Gentle surfactants, reduced stripping, balancing the scalp's own condition and a comfortable dilution are legitimate strategies for mild flaking and require no restricted active at all.

Why the Base Surfactant System Matters as Much as the Active

A significant share of flaking complaints come from an irritated scalp rather than from the organism the actives target. A harsh anionic surfactant system strips the scalp and produces a response that looks like dandruff and does not improve with an anti-dandruff active. Many consumers using an anti-dandruff shampoo alongside an aggressive cleansing routine are treating the symptom of the routine rather than the cause of the flaking.

For a shampoo in this category, the formulation direction is therefore a mild surfactant blend with a lower total surfactant content than a volume shampoo, buffered to a scalp friendly pH, with the active dosed correctly and a conditioning system that does not mask the active. Thickening is achieved with a salt curve or an associative thickener at a level that keeps the product pourable.

Formulating Notes That Come Up Every Time

Solubilisation. Piroctone olamine and climbazole are only partially water soluble. They must be solubilised in a surfactant or glycol system before addition, otherwise they recrystallise and the product fails the assay without any visible change.
Temperature limit. Add the active during cool down, below about 45 degrees Celsius. Adding it with the hot water phase degrades part of it silently, and the assay at the end of the batch is the only indication.
Viscosity interaction. Some actives interfere with the salt thickening curve or with the associative thickener. The viscosity has to be adjusted after the active is in the formula, not before.
Colour instability. Several actives discolour over time, particularly in the presence of metal ions. A chelating agent and an opaque or coloured pack extend the colour stability, which matters because an anti-dandruff shampoo that turns yellow looks off to the customer.
Pack compatibility. The actives can corrode metal and affect certain pump elastomers. A plastic spring or a coated component is often needed.

Scalp Serums and Leave-On Treatments

Leave-on scalp treatments are the fastest growing format in this category and they carry a different set of constraints. Because the product stays on the scalp, the permitted active concentrations are typically lower than in a rinse-off shampoo, the preservative system has to suit a leave-on, and the sensory profile has to be acceptable for daily use.

Formulating a leave-on around piroctone olamine and a cooling agent with a light hydro-alcoholic base is the common route. The alcohol level should be kept modest because a scalp that is already irritated reacts badly to it, and the applicator should reach the scalp rather than depositing product on the hair. A nozzle applicator is the practical solution.

The Claim Boundary

This is where most problems arise. Words that describe the appearance of the scalp and hair are cosmetic. Words that describe a condition are medicinal.

Acceptable. Helps reduce the appearance of visible flakes, helps control the look of flaking, cleanses the scalp, leaves hair looking cleaner for longer, helps soothe the look of a dry scalp.
Not acceptable for a cosmetic. Treats dandruff, cures seborrhoeic dermatitis, eliminates the cause of flaking, medically proven, dermatologically recommended without the study to support it.

Because flaking has a medical name that consumers use freely, the temptation to use it in copy is strong, and it is the single most common reason a product in this category gets rejected by a marketplace or flagged by a regulator. Restricting the language to appearance keeps the product a cosmetic in every major market.

Testing for This Category

Alongside standard stability and challenge testing, the useful studies are a flake score assessment by a trained assessor on 30 to 60 volunteers over four to eight weeks, and a scalp comfort assessment covering itching and tightness. Both produce a number and both support the appearance based claim. Where the product is positioned for a sensitive scalp, patch testing on the target group adds protection against complaints.

Assess on a defined wash frequency and with a standardised shampoo quantity. Flaking scores are sensitive to how often the product is used, so an uncontrolled protocol produces results that cannot be repeated.

Scalp and Anti-Dandruff Formulas With Market Ready Actives

OEM COSMETICS ODM produces anti-dandruff shampoos, scalp scrubs, leave-on scalp serums and treatment tonics on ISO 22716 and GMP certified lines, selecting actives that are permitted in each destination market and pairing them with a mild surfactant base. Tell us where you will sell and we will confirm which actives are available and at what level.

Talk to our team: WhatsApp +86 18709713948 · Email adon@oemcosmeticsodm.com · Website www.oemcosmeticsodm.com