Developing hair and scalp care in Korea starts with the surfactant system, not the actives list. It decides lather, rinse, after-feel and whether the scalp reacts. Choose it together with the positioning (cleanser or scalp treatment), then set viscosity and fragrance, and plan volume early, because large fill sizes make the bulk batch, not the bottle, the usual constraint.
This guide is about the order of decisions once you have chosen to make a shampoo or a scalp line. Finding the right Korean manufacturer for the category, and the formats it covers, is the job of our hair and scalp care manufacturing page. What follows is the part that happens before and during sampling, and why it runs differently from facial skincare.
Why Does the Surfactant System Come First?
Because a shampoo is judged in the shower in a few seconds, and almost everything the user notices in that time comes from the surfactants. How fast it foams, how dense the foam is, how the hair feels while wet, how quickly it rinses and how the scalp feels an hour later all trace back to which cleansing agents are in the formula and in what balance.
A shampoo usually combines a primary surfactant that does most of the cleaning with one or more secondary surfactants that soften it, build foam and adjust the feel. That combination then sets several things at once:
- Mildness. How much oil the formula strips, and whether a sensitive scalp tolerates daily use.
- Thickening. Some systems thicken readily with salt and others need polymer thickeners, which changes cost, clarity and how the product pours.
- pH window. The workable pH range of the system limits which actives and preservatives can sit inside it.
- Conditioning. Conditioning polymers deposit on hair through their interaction with the surfactants, so the same polymer can feel very different in two systems.
- Cost per kilogram. Surfactants make up a large share of a shampoo's ingredients, so the choice shows directly in the unit cost.
This is why choosing actives first usually means choosing them twice. A scalp active that works in one system can be unstable, cloud the product or lose its feel in another. Settle the system, then put the actives into it.
Cleanser or Scalp Treatment: The Positioning Decision
Korean hair care has a strong scalp-health segment, and the positioning you pick inside it changes the product more than the label suggests. A shampoo sold as a cleanser and one sold as a scalp treatment can look alike on a shelf and still be different formulas.
| Positioned as a cleanser | Positioned as a scalp treatment | |
|---|---|---|
| What the user judges | Lather, slip, hair feel after drying | How the scalp feels over days and weeks |
| Surfactant direction | Full lather, good rinse, conditioning on the lengths | Gentler cleansing, often lower foam |
| Actives | Mostly for hair feel and shine | Chosen for the scalp, with time on the skin in mind |
| Fragrance | A main reason to buy | Usually lighter, sometimes none |
| Typical range | Shampoo and conditioner | Shampoo with a scalp tonic, serum or scrub |
| Claim pressure | Low | High, because scalp wording drifts toward treatment |
Neither column is better. The mistake is to brief one and expect the other: a cleanser with a scalp claim printed on it, or a scalp treatment that users judge on foam and find disappointing. Write one sentence that says which product this is and who uses it, and give it to the lab with the brief. How to brief a Korean formulation lab covers the rest of what that brief needs.
A scalp line also changes the range. Many scalp products work better as a cleanser and a leave-on step together than as one shampoo asked to do both, because a rinse-off product spends little time on the skin. Decide early whether the shampoo stands alone or anchors a routine, since that sets how much the shampoo itself has to carry.
What Sulphate-Free Actually Changes
Sulphate-free is a positioning choice with formulation consequences. Moving away from sulphate surfactants toward milder alternatives such as amino acid surfactants can make a gentler product, and it changes several things the brand will notice.
Foam. Many sulphate-free systems produce less foam, or a looser foam, before any adjustment. Users read low lather as "not cleaning" even when the hair is clean, so the formula usually needs secondary surfactants and foam boosters to reach a lather people accept. That work takes sampling rounds and raises the cost.
Thickness. Sulphate systems often thicken with a little salt. Many milder systems respond less, so viscosity has to be built another way, usually with polymers. This affects clarity, pour and the choice of pump.
Cost. The milder surfactants are generally more expensive per kilogram, and the extra ingredients needed to restore foam and thickness add to it.
What it promises. "Sulphate-free" on the front of the bottle is a free-from claim, and it invites the question of what replaced the sulphates. Agree how you will describe the system before artwork, using the same logic as other free-from claims in clean beauty claims and what they commit you to.
A straight swap that expects the old foam is where sulphate-free projects usually disappoint. If foam matters to your customer, say so in the brief, and expect the lab to spend rounds on it.
Viscosity, Fragrance and the Cold-Weather Check
Viscosity and fragrance are often treated as finishing touches. In shampoo they interact with the surfactant system and with the packaging, so they belong in the brief as targets.
Give viscosity as a range. Too thin reads as watered down, too thick will not pour or pump. A single number in the brief gets matched once and then drifts with every adjustment. A range the product must stay inside, measured the same way each time, survives the sampling rounds.
Check it cold. Many shampoos thicken noticeably as they cool. A formula that pumps well in a warm lab can refuse to leave the bottle in an unheated warehouse, a cold bathroom or a shipping container in cold weather. Ask for samples to be checked at low temperature as well as at room temperature, and test the actual pump, not just the bulk in a beaker. The heat side matters too, because pearlised and opaque shampoos can separate when stored warm. What a full stability programme covers is set out in cosmetic stability testing explained.
Fix fragrance early. Rinse-off products usually carry more fragrance than leave-on care, but a scalp-sensitive position pulls the level down. Fragrance oils can also change the viscosity and clarity of a surfactant system, so a scent chosen after the base is approved can send the formula back for another round. Choose the fragrance direction, and the level your claim allows, while the base is still moving.
Match bottle and pump to the bulk. Pump output, dip tube and orifice size are chosen for a viscosity range. A thick, opaque shampoo needs a different pump from a thin, clear one, and stock pumps come in fixed specifications. Settling this alongside the viscosity range avoids discovering at filling that the chosen pump struggles. Our cosmetic packaging sourcing work matches components to the formula for this reason.
What Can a Scalp Product Claim?
A scalp product can make cosmetic claims about cleansing, feel and appearance: it cleans the scalp, leaves it feeling fresh, leaves hair looking fuller. Wording about hair loss or hair regrowth reads as treatment rather than care, and that is where the line sits. Dandruff is less clear-cut: an anti-dandruff claim is ordinary cosmetic wording in some markets and a regulated claim in others.
In many markets those treatment-type claims move a product out of the ordinary cosmetic category and into a separately regulated one. Which category it moves into, and what that category then requires, depends on the ingredient, its concentration and the destination market. Check this before formulating, because a claim decided after the formula is fixed can mean a different active, a different concentration or a different route to market.
Two practical consequences follow. First, write the claim set before the brief, not after the first sample, and let it shape the actives. Second, keep the scalp story inside cosmetic language in every place it appears, including captions and retailer listings, because a claim does not become cosmetic by appearing somewhere less formal.
Why Do Minimums Work Differently in Hair Care?
Because fill sizes are several times larger than in facial skincare. The same number of units needs far more bulk, so in hair care the bulk batch is usually the minimum that binds, rather than the bottle, the pump or the cap.
A manufacturer's minimum comes from six separate minimums stacked together, and usually one of them binds hardest. The minimum order guide explains each of them. Hair care shifts which one that is. That changes what helps:
- One base across two fill sizes. A travel size and a full size filled from the same batch use the bulk more fully, and this is the most common way to reach a workable first run.
- One base across variants. A shampoo and a scalp shampoo that share a surfactant base, and differ in actives or fragrance added later, can sometimes share the batch.
- Stock bottles and pumps. Hair care uses common bottle and pump shapes, so stock components are widely available, and custom tooling adds its own minimum on top of the bulk.
Each of these, and the trade-off it asks for, is covered in how to reduce your cosmetic MOQ. The fill size is worth deciding early for the same reason: it is the number that turns a unit plan into a bulk quantity.
A Development Order That Holds
The order below keeps each decision from reopening an earlier one. It is not the only workable order, but in this one each step builds on the one before it.
- Positioning and claims. One sentence on what the product is and who uses it, plus the claims you intend to make in each market.
- Surfactant system. Chosen against that sentence, with your foam expectation and any sulphate-free requirement stated.
- Viscosity range and fragrance direction. Written as targets, with a cold check agreed.
- Actives and conditioning. Added inside the approved system.
- Packaging. Bottle, pump or cap and fill sizes matched to the viscosity range.
- Stability. Run on the chosen packaging, cold and warm.
- Volume plan. Fill sizes and variants arranged so the bulk batch is used well. Sketch it at step 1 and confirm it here.
Brands that reverse steps 2 and 4 usually redo the actives. Brands that leave fragrance to the end often redo the viscosity. Our cosmetic formulation development work follows this order with the Korean lab running your project, and the Korean shampoo development page lists the systems and formats the labs we work with can develop.
Frequently Asked Questions
Can I start from an existing shampoo base?
Yes, and it is often the fastest route. An existing base already has a proven surfactant system, so development becomes adjusting fragrance, actives, viscosity and colour within what the base tolerates. Changing the surfactant system itself turns it into a new development.
Agree in the contract what you will own at the end. That depends on the manufacturer and on where development starts, not on whether the route is called OEM or ODM.
Should shampoo and conditioner be developed together?
Develop them in parallel if they will be sold as a pair. They are separate formulas with different chemistry, but they should share a fragrance, a feel and a packaging family, and a fragrance that works in one base may need adjusting in the other.
Launching the shampoo first and adding the conditioner later also works, as long as the fragrance and packaging decisions are made with the pair in mind.
How many sample rounds does a shampoo take?
Usually two to three on a precise brief, and around six when the brief is vague. Foam targets, sulphate-free requirements and a late fragrance change are the usual reasons the count grows.
Judge each round over several washes rather than one. Build-up and after-feel often show only after a few days of use. The sampling process explains what each round should settle.
Can a shampoo be sold as a hair-loss treatment?
Not as an ordinary cosmetic in many markets. Hair-loss wording reads as a treatment claim, and treatment claims can move a product into a separately regulated category. The outcome depends on the ingredient, its concentration and the destination market, so check it before formulating.
A shampoo can describe what a cosmetic does: cleansing the scalp, and leaving hair feeling and looking fuller.