Brightening is one of the largest skincare categories in the world and one of the most regulated. The reason is that the boundary between a cosmetic that improves the appearance of tone and a product that interferes with melanin physiology is genuinely thin, and regulators in every major market have placed it deliberately.
The consequence for a brand is that this is the category where the label wording most directly determines the regulatory pathway. The same formula can be an ordinary cosmetic, a product requiring registration with human efficacy testing, or a product that cannot legally be sold, depending on the claim printed on the box and the market it is sold in.
This guide covers the actives that are permitted and where, the substances that are prohibited and still commonly requested, the formulation practicalities of a brightening product, the instrumental testing that supports a tone claim, and the specific trigger that turns a brightening product into a registered special cosmetic in China.
Restricted substance lists in this category have been amended repeatedly. Confirm the current permitted concentrations for each target market before the formula is frozen.
Why brightening is a claim decision before a formula decision
Skin tone appearance is influenced by several factors: the amount and distribution of melanin, the presence of surface pigment, the condition of the surface barrier, hydration, and the way light reflects from the skin surface. A cosmetic can influence the last three, and it can influence the appearance of the first two without altering melanin physiology.
A claim that stays within that space is available to a cosmetic product. A claim that asserts an effect on melanin production, on pigmentation disorders, or on a medical condition is not. The wording therefore has to be chosen deliberately, and it should be chosen before the formula is developed so that the testing can be matched to it.
There is also a commercial dimension that has grown in importance. Many brands now avoid the word whitening altogether in favour of even tone, radiance and dark spot correction, for both regulatory and market-positioning reasons. The substitution costs nothing and it removes a category of risk, including the risk of a claim perceived as making a judgement about skin colour.
The actives that do the work
A small group of actives covers almost the entire category, and each has a different mechanism, a different stability profile and a different permitted position across markets.
| Active | Why it is used | Formulation note | Regulatory note |
|---|---|---|---|
| Niacinamide | Even tone and barrier support | Works across a wide pH range; avoid the low end of the pH scale | Widely permitted; easy to file in most markets |
| Vitamin C and derivatives | Radiance and the appearance of surface pigment | L-ascorbic acid needs low pH, chelation and protection; derivatives are more stable and less potent | Permitted widely; the derivative chosen affects stability and cost |
| Arbutin and alpha-arbutin | Appearance of surface pigment | Water-soluble, easy to formulate, sensitive to hydrolysis | Subject to concentration limits in some markets; confirm the current position per market |
| Kojic acid | Appearance of surface pigment | Prone to discolouration in the presence of light and metal ions | Permitted in many markets and treated differently in others |
| Tranexamic acid | Even tone | Water-soluble, stable, easy to combine | Well established in Asian markets; check the permitted position per market |
| Licorice and glabridin | Soothing and even tone support | Often supplied as a standardised extract; check colour and odour | Permitted widely; standardisation matters for consistency |
Two combinations work particularly well in practice. Niacinamide with tranexamic acid gives a well-tolerated, stable formula that is straightforward to file in most markets. Vitamin C with an antioxidant partner and chelation gives a formula with a stronger radiance story, at the cost of more demanding stability work and a need for protective packaging.
The substances brands still ask for, and why we decline
Requests for hydroquinone and for mercury-containing preparations still arrive, usually from brands that have seen them in products from other regions. Both are prohibited in cosmetic products in the European Union, China and many other markets, and in the United States hydroquinone is available only through the drug framework rather than as a cosmetic ingredient. Mercury compounds in skin lightening products are prohibited essentially everywhere and have been the subject of international action under the Minamata Convention.
Our position is that we do not manufacture cosmetic products containing either substance, and that we explain the alternative instead. The alternatives are genuinely effective for the appearance of tone, and a brand that launches a compliant brightening range sells into more markets and carries less risk than one that does not.
A third family deserves a caution: certain resorcinol derivatives used for pigmentation have been subject to restrictions in some markets and the position has moved. Where a brand asks for a specific phenolic active, the first step is to confirm its current status for each target market rather than relying on the position that applied when the ingredient became popular.
Formulating a brightening product
Three practical issues dominate brightening formulation.
Stability is the first. Several of the most effective actives, including L-ascorbic acid and kojic acid, degrade through oxidation and are sensitive to light and to trace metal ions. The formulation response is an antioxidant system, a chelating agent, control of dissolved oxygen and metal contact during processing, and packaging that excludes light and air. A brightening product in a clear bottle with a wide mouth is a formulation problem waiting to appear as a colour change.
Solubility is the second. The most commonly used actives are water-soluble, which suits serums, essences, toners and gel creams. Placing them in a rich emulsion reduces the achievable concentration and can destabilise the emulsion, so a brightening product is usually lighter in texture than the rest of the range.
Irritation is the third. Consumers using a brightening product often combine it with an exfoliating product, and the combination of a low-pH vitamin C serum and an acid toner produces a tolerance problem that the consumer attributes to the brightening product. A well-designed formula at a more moderate pH with barrier-supportive components reduces that risk, and the use instructions on the pack should be written to discourage the worst combinations.
Testing that supports a tone claim
Tone claims are supported instrumentally, and the instruments are well established.
Colorimetry measures the colour of the skin in a defined colour space, producing values that can be compared before and after treatment. It is the most common instrument for an even-tone claim. Mexametry measures melanin and haemoglobin content separately, which allows a claim to distinguish between pigment-related and vascular-related appearance. Standardised photography with image analysis supports claims about the appearance of dark spots and about overall evenness.
Three design details decide whether a result will be accepted. The measurement site must be consistent, because tone varies across the face. The environmental conditions and the time of day must be controlled, because tone varies with temperature, hydration and time since washing. And the study must have a control, either a placebo or a baseline comparison with a defined statistical treatment.
For the strongest claims, a human efficacy study with a defined panel and a defined protocol is the standard. In some markets, and for some claims, that study is not optional but a precondition of selling the product at all.
The China trigger that changes everything
In China, a cosmetic product making a whitening or spot-correcting claim is classified as a special cosmetic rather than an ordinary cosmetic. The practical consequences are substantial.
Special cosmetics require registration rather than filing, which means a longer process. The efficacy claim requirements mean that the whitening or spot-correcting claim has to be supported by human efficacy evaluation in addition to the safety and stability work. Ingredients must be on the approved inventory. And the registration is product-specific, so a range means multiple registrations.
The outcome for a brand is a straightforward strategic choice. A product positioned on hydration, radiance, barrier support and even tone can follow the ordinary filing route. A product positioned explicitly on whitening or spot correction follows the registration route with the additional human efficacy testing. Both are viable, and both are legitimate, but they are different projects with different timelines and costs.
Our advice is to make that decision at brief stage. A formula developed for the ordinary route and then reclassified costs an entire additional study cycle, and the reformulation may also be required to align with the approved ingredient inventory.
What should a brightening brief contain?
Specify the product format, the intended claim wording in full, the active set and the target concentrations, the tolerance profile, the pack type, the target markets, the first order quantity and the target cost. Where the brand intends to sell in China, state at brief stage whether a whitening or spot-correcting claim is planned, because it determines the registration pathway.
Compliance notes for the EU, US and China
In the European Union the product is a cosmetic under Regulation 1223/2009, requiring a Responsible Person, a Product Information File, a Cosmetic Product Safety Report and CPNP notification. Claims are assessed against the common criteria in Regulation 655/2013, and tone claims must be substantiated. Hydroquinone and mercury compounds are prohibited in cosmetics.
In the United States, the Modernization of Cosmetics Regulation Act imposes facility registration, product listing, safety substantiation and adverse event obligations on the brand or importer. Cosmetic brightening claims are generally available, but a product that claims to treat a pigmentation disorder or contains hydroquinone falls under the drug framework.
In China, cosmetics are managed under the Cosmetics Supervision and Administration Regulation with a filing route for ordinary cosmetics and a registration route for special cosmetics. Whitening and spot-correcting claims trigger the special category, the approved ingredient inventory applies, and the efficacy claim requirements demand human efficacy evaluation.
Frequently asked questions about brightening product OEM
Can you manufacture a product containing hydroquinone?
No. Hydroquinone is prohibited as a cosmetic ingredient in the European Union, China and many other markets, and in the United States it is available only through the drug framework. We will propose compliant alternatives that address the appearance of tone.
What is the safest claim wording?
Appearance-based and descriptive wording such as even tone, radiance, the look of dark spots and a more uniform complexion. Claims about mechanism, about melanin production or about a pigmentation disorder should be avoided.
Can you match a brightening serum we already sell?
We can benchmark an existing product and develop a formula to the same brief. We do not copy a third party formula, and we ask brands to confirm they hold the rights to any formula they ask us to reproduce.
How long does development take?
A first sample typically takes two to three weeks after the brief is frozen. Instrumental tone studies and, where required, human efficacy evaluation are longer and should be scheduled alongside stability work at the start of the project.
Do you supply the reports needed for filing and claims?
Yes. Stability, pack compatibility, microbiological challenge and safety documentation are standard, and we can arrange colorimetry, mexametry and image analysis studies through accredited laboratories.
Next step: choose the wording, then the formula
If you are developing a serum, essence, toner or cream with a tone or radiance claim, send us the format, the claim wording you intend to use and your target markets, and we will advise on the permitted position, propose an active set and preservation route, and provide a costed quote. Write to capsulebiotech@163.com, message the right team on WhatsApp: Capsule Series (capsules only) +86 158-7655-5319, Cosmetics Series (serum, hair care, body care, fragrance) +86 158-7655-5319, or use the inquiry form and we will reply within one working day.
Related programmes and guides: niacinamide face serum, vitamin C brightening face cream, dark spot corrector face cream, and vitamin E and licorice brightening serum softgels.