Sulfate-Free Shampoo for Brands: Surfactant Choices, Sample Tests and a Manufacturing Brief

Quick answer

A sulfate free shampoo is a shampoo whose cleansing system leaves out a defined list of sulfate surfactants, commonly including sodium lauryl sulfate (SLS) and sodium laureth sulfate (SLES). For a brand, the useful version of that sentence is the list itself. Write down exactly which ingredients are excluded, choose a cleansing system deliberately, and judge samples against a reference under comparable conditions. Check foam, thickness, rinse feel and cost in the actual formulation; the label does not predict these results.

Sulfate-free is a formulation choice with trade-offs. It is not automatically milder, safer or better for every hair type, and the label alone says nothing about how a shampoo will perform.

This guide is written for brand owners and product developers who are deciding on a formula route and a sample round. If you are already choosing between suppliers, our private label shampoo project page covers the formats and quote inputs on the manufacturing side.

What "sulfate-free" should mean in your brief

A consumer may understand sulfate-free to mean simply “without SLS or SLES,” while a manufacturer needs an exact exclusion list. Briefs that say only “sulfate-free, gentle, natural” leave three different requirements unresolved. The ingredient exclusion can be checked against a formula and supplier documentation; the other claims need their own definitions and support.

Write an exclusion list, not an adjective

"Sulfate-free" becomes a specification when it names ingredients. A workable brief states the exclusion list in INCI names, for example:

• Sodium Lauryl Sulfate
• Sodium Laureth Sulfate
• Ammonium Lauryl Sulfate and Ammonium Laureth Sulfate
• Sodium Coco-Sulfate
• Any other alkyl sulfate or alkyl ether sulfate, stated as a category

The last line matters. Sodium Coco-Sulfate is often presented as a plant-derived option, but chemically it is an alkyl sulfate. Whether it is allowed in your product is your decision, and the brief should say so explicitly, because suppliers do not all read "sulfate-free" the same way.

Also decide what is not excluded. Several common surfactants have "sulf" in their names but are not sulfates: sulfosuccinates, sulfonates (such as sodium C14-16 olefin sulfonate) and sulfoacetates. Some brands keep them; some exclude them to avoid customer questions about the ingredient list. Either choice is defensible. Leaving it unstated is the problem, because it produces samples built on different assumptions.

Decide whether ethoxylated ingredients are in scope

Some brands use "sulfate-free" as shorthand for "no SLES" because of concern about 1,4-dioxane. That is a different requirement. FDA describes 1,4-dioxane as a trace contaminant that can form as a byproduct when certain ingredients are made, and identifies them by markers such as "PEG," "polyoxyethylene," "-eth-" or "-oxynol-" in the name (FDA, 1,4-dioxane in cosmetics). A sulfate-free formula can still contain ethoxylated ingredients, for example a PEG-based thickener or solubilizer.

So if the real goal is to manage 1,4-dioxane, say that in the brief. Then either exclude ethoxylated ingredients as well, or ask for raw material grades and documentation that address it for your target market. Our oil control shampoo formulation guide discusses this sourcing question for SLES-based systems.

Keep "gentle" and "natural" as separate claims

"Gentle," "mild" and "natural" are not the same claim as "sulfate-free," and none of them follows from it. A sulfate-free shampoo can still be harsh if the overall surfactant level is high, the pH is unsuitable or the fragrance is strong. A natural-positioned shampoo can use synthetic preservatives. If those words will appear on pack, list them in the brief as separate claims that each need their own support.

Know the regulatory starting point

In the United States, FDA does not pre-approve cosmetic claims and has no list of accepted claims. Labeling, including claims, must be truthful and not misleading (FDA, Cosmetics Labeling Claims). In the EU, the 2017 technical document on cosmetic claims gives guidance on "free from" claims. It says the absence of a specific ingredient should be demonstrated by adequate and verifiable evidence, and that free-from claims should not imply a denigrating message based on a presumed negative perception of an ingredient's safety. The EU cosmetics legislation and claims page lists that document for readers who want to check it. The document does not give a sulfate example, so ask a regulatory professional in your market how a sulfate-free claim and its wording will be judged. Our cosmetic claims compliance guide covers the wider claim boundaries.

The alternative cleansing systems, in plain terms

If an existing shampoo relies on SLS or SLES, replacing those surfactants may change its foam, cleansing, viscosity and feel. The replacement is a complete formulation decision rather than a one-for-one ingredient swap.

A formulator may combine a primary surfactant with amphoteric or nonionic partners to tune foam and viscosity. As one supplier example, Stepan's published STEPANBLEND ASF/MB product description reports foam and a response to salt, while its shampoo formulation 1541 shows a specific use. These are supplier examples, not evidence that every ingredient family behaves the same way or that GZ uses the formula. The source titles are listed at the end of this guide.

The table below is a shortlist of possible ingredient families and the questions to settle during sampling. For example, BASF's published Plantacare 818 UP description identifies Coco-Glucoside as a nonionic surfactant used in shampoos. Supplier descriptions cover individual materials; the finished formula determines the result. Do not infer mildness, foam, cost or stability from a family name alone.

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When you request samples, ask each supplier to name the primary and secondary surfactants by INCI. You do not need the percentages to compare samples, and a supplier may treat them as confidential. You do need to know which system you are evaluating, so that a later revision can be traced.

The trade-offs that matter in practice

Cleansing. A sulfate-free formula can be designed for a lighter wash or a stronger cleanse. The absence of sulfates does not tell you which one you have. Decide which user and wash routine you are designing for, then compare clean feel and residue against a relevant reference. Include people with the intended hair and scalp conditions in the review.

Foam. A sulfate-free sample may foam differently from the product it replaces, but good foam is possible: Stepan's supplier prototypes provide examples. Compare speed, volume, texture and persistence on the first and second wash. If you ask for more foam, have the formulator explain what else in the formula would change, then recheck the finished sample.

Viscosity. Some sulfate-free systems thicken with salt; others need a different surfactant balance, polymer or thickener. Do not assume either outcome from the label. Ask how the actual sample is thickened, and check every thickener against any separate ethoxylated-ingredient exclusion in your brief.

Rinse feel and conditioning. The finished blend, including any conditioning polymers, determines whether hair feels squeaky, soft or coated. Judge rinse and wet feel separately from foam, and ask which parts of the formula a proposed adjustment would affect.

Fragrance. If you change a cleansing base, check clarity and scent in the new finished formula rather than assuming the previous fragrance result carries over. If you plan to keep an existing fragrance, say so early.

Preservation. A change in surfactants can change the finished pH and other conditions that affect preservation. Confirm the preservative system for the final formula through the appropriate testing; a pleasant sample feel does not establish preservation. Our preservative challenge testing guide explains the question.

Cost. Raw-material grade, dosage, thickening, fragrance, pack and order volume all affect the quote. Compare the cost of complete candidate formulas rather than assuming every sulfate-free system has the same premium.

Package compatibility. Any reformulation may change flow and dispensing. Check the final candidate in the intended production pump or cap, not only in a sample jar. Our packaging compatibility testing guide covers what to confirm.

A sample comparison plan for brand teams

Our shampoo sample evaluation guide covers general sample logging, review sheets and feedback across suppliers. This section adds what is specific to sulfate-free: a sulfate reference, a few simple bench checks and the attributes most likely to separate one sulfate-free system from another.

Set up the comparison

Include a reference. Put one known product into every round: your current shampoo, or a sulfate-based product your customers already use. It anchors the panel's judgment. Without it, "foam is low" has no baseline.

Code everything. Decant or overlabel samples with neutral codes so testers do not react to brand names or to the words "sulfate-free."

Fix the conditions. Keep the dose (for example, one pump or a measured amount), water temperature, wash routine and follow-up conditioner the same for every sample. Note your water hardness if you know it. Hard and soft water can change how a sulfate-free shampoo lathers and rinses, and your customers may not use the same water as your test team.

Match testers to the brief. If the product is for fine, oily hair, testers with thick, dry hair will give you the wrong answer. Record hair type, scalp type, wash frequency and any chemical treatment for each tester.

Separate washes. Review each sample on separate wash days. Do not compare two shampoos on the same head on the same day.

Confirm suitability first. Before anyone uses a sample, ask the supplier to confirm it is suitable for use and to provide directions and precautions. Do not use people to find out whether an unclear sample is safe.

Bench checks you can do without a lab

These are simple observations, not measurements to put on a specification:

• Appearance and clarity at room temperature, and after a night in a cool place if you sell into cold climates.
• Pour and dispensing through the intended pump or cap: drip, stringing, clogging, dose size.
• Lather in the hand with a fixed amount of water: how fast it forms, how dense it looks, how long it lasts.
• Fragrance on opening, in the lather and on dry hair after a few hours.
• Refill behavior, if a refill format is actually planned: ask the formulator how the finished refill is intended to be dispensed and tested. Do not dilute a sample in its bottle as a substitute for preservation or compatibility testing.

Score sheet for sulfate-free attributes

Score each attribute 1 to 5 against the reference, where 3 means "same as reference." Record "not evaluated" when an attribute was not checked. A blank looks like a pass.

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Keep the ingredient-list row outside the sensory score. A sample that fails the exclusion list is out, however well it performs.

In-house screening versus formal testing

An internal sample review tells you which sample is worth developing. It does not show that a formula is stable, adequately preserved, safe for its intended use or able to support a performance claim. Those need formal work, arranged and reviewed with the manufacturer and qualified professionals:

• Stability and package compatibility over time and temperature, with the final formula in the final pack; review the actual report rather than treating a short bench observation as a pass.
• Preservative efficacy, especially after a surfactant or pH change.
• Safety assessment as required for your target market.
• Claim support. "Sulfate-free" is supported by the formula and the ingredient documentation from raw material suppliers. Performance claims such as "lathers like a regular shampoo" or "gentle for daily use" need evidence designed for that claim. A structured consumer testing panel is one possible route for perception claims.

Avoid treatment claims entirely in an in-house review. FDA notes that an antidandruff shampoo is both a cosmetic and a drug because one of its intended uses is to treat dandruff (FDA, Is It a Cosmetic, a Drug, or Both?). The same FDA page lists claims that a product will restore hair growth as an example of a drug claim. A sulfate-free label does not change that.

Three buyer scenarios

These are illustrative scenarios written to show how the brief changes the decision. They are not client cases or test results.

Scenario 1: Switching an existing SLES shampoo to sulfate-free

A brand sells a mass-market daily shampoo built on SLES and wants a sulfate-free version without losing repeat customers. The desired outcome is "customers should not notice the change, except on the label."

The brief should name the current product as the reference and define which foam and clean-feel differences the brand will accept. An olefin sulfonate-led option or a different blended system could be candidates to test, but the INCI list and actual sensory result both matter. The brand should decide how to weigh ingredient preferences against the experience before choosing a sample. Ask for the sample quote before the second round, recheck fragrance in the new base and test the existing pump with the final viscosity.

Scenario 2: A low-foam wash for curly and coily hair

A brand targets customers with curly and coily hair who wash once or twice a week and use leave-in products. The desired outcome is a gentle cleanse with good slip and minimal frizz. Lower foam is acceptable and will be explained on pack.

Here, maximum foam is not the priority. Rinse feel, wet detangling and dry feel on the second day carry the decision, so the panel must include testers who match this brief. An amino acid or glucoside-led blend with a suitable conditioning system is one possible starting point, but the panel decides, not the family name. The claim set needs particular care: "gentle," "moisturizing" and "for curly hair" are separate claims and each needs support.

Scenario 3: An export brand with a strict exclusion list

A brand plans to sell in the US and the EU and wants "free from SLS, SLES and ethoxylated ingredients." The desired outcome is an ingredient list that matches that promise in both markets.

The exclusion list should name the categories, including ethoxylated thickeners and solubilizers, so the formulator does not quietly replace one excluded ingredient with another. The brief should ask the manufacturer for raw material documentation supporting the absence claims. It should also ask a qualified reviewer to assess the proposed wording for each target market, because "free from" phrasing is judged case by case. Excluding ethoxylated thickeners may narrow the viscosity and clarity options, so check clarity, dispensing and cold storage in the proposed formula.

What to send a manufacturer: the sulfate-free brief

A clear brief lets a supplier propose a route and quote it. For a sulfate-free shampoo specifically, include the items below. Fill in what you know and mark the rest "to discuss."

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On MOQ and lead time: both depend on the formula route, packaging, testing and market, so ask for them in the quotation for your specific configuration. A catalogue figure for a standard format does not automatically apply to a reformulated or custom sulfate-free shampoo.

When the brief is ready, you can send it through our quote form and put the exclusion list and reference product in the project details. If you are still comparing formats, start with the private label shampoo project page.

Frequently asked questions

Is sulfate-free shampoo better for hair?

Not universally. Sulfate-free describes an ingredient exclusion, not the finished product's mildness or cleansing strength. Compare actual formulas with the needs of the intended user; the right choice depends on the complete product, not the label alone.

Is Sodium Coco-Sulfate sulfate-free?

No. Sodium Coco-Sulfate is an alkyl sulfate. Whether you allow it is a brand decision, so name it in your exclusion list either way.

Are sulfonates and sulfosuccinates sulfates?

No, they are different chemical families. Some brands still exclude them to avoid confusion on the ingredient list. State your choice in the brief.

Does sulfate-free mean free of 1,4-dioxane?

Not necessarily. 1,4-dioxane can form as a byproduct in ethoxylated ingredients, and a sulfate-free formula can still contain them. If 1,4-dioxane is your concern, address it directly in the brief.

Why does my sulfate-free sample foam less?

Foam depends on the particular surfactant blend, dosage and use conditions. Some sulfate-free formulas foam strongly; others do not. Compare the sample against a reference under the same conditions, then ask what changes could improve it and which other attributes need rechecking.

Why is my sulfate-free shampoo thin?

Salt works in some sulfate-free blends and poorly in others. Ask how this sample is thickened, then check its ingredient list, clarity and dispensing in the intended pack.

Can a sulfate-free shampoo make hair-loss claims?

The exact claim matters. In the United States, FDA gives “restore hair growth” as an example of a drug claim; a claim to treat a hair-loss condition also raises a drug question. A claim about the appearance of hair or reduced breakage has a different meaning, but still needs evidence and careful wording. Ask a qualified regulatory reviewer to assess the precise proposed claim and market before using it on pack.

Do I need new testing if I switch an existing shampoo to sulfate-free?

Usually, yes. A new surfactant system is a new formula. Expect stability, packaging, preservation and safety work to be confirmed for the new version. Ask the manufacturer which existing results still apply.

Takeaway

A sulfate-free shampoo project starts with an exact INCI exclusion list, an intended user and a reference product. Compare complete surfactant systems for foam, cleansing, feel and cost, then verify thickness, fragrance, preservation and packaging in the finished candidate. Use an internal review to choose a direction and appropriate formal work to support product safety and claims.

If you have a brief ready, include your exclusion list, reference product, market and packaging in the inquiry.

Sources

• U.S. Food and Drug Administration, Cosmetics Labeling Claims; accessed 2026-11-05.
• U.S. Food and Drug Administration, 1,4-Dioxane in Cosmetics: A Manufacturing Byproduct; accessed 2026-11-05.
• U.S. Food and Drug Administration, Is It a Cosmetic, a Drug, or Both?; accessed 2026-11-05.
• Sub-Working Group on Claims, endorsed by the Working Group on Cosmetic Products, "Technical document on cosmetic claims," 3 July 2017, Annex III. Best-practice guidance, not a European Commission document. The EU cosmetics legislation and claims page lists it; accessed 2026-11-05.
• Stepan, "STEPANBLEND ASF/MB" product page and "Super Easy-to-Make Mild, Sulfate-Free Shampoo" formulation No. 1541. Supplier examples only, not a universal result or a GZ formula; accessed 2026-11-05.
• BASF, "Plantacare 818 UP" product page. A supplier description of one material, not independent comparative testing or a GZ formula; accessed 2026-11-05.