Cosmetic Ingredient Restrictions in Thailand: A Brand Guide

How the Thai System Is Structured

Thailand regulates cosmetic ingredients through a list-based approach aligned with the ASEAN Cosmetic Directive, which the member states adopted to harmonise their rules. Understanding the four categories of list is most of the battle.

**Prohibited substances.** Ingredients that may not be used in cosmetic products at all. This list is long and includes substances that are pharmacologically active, genuinely toxic, or otherwise unsuitable for unsupervised consumer use.

**Restricted substances.** Permitted, but only within defined conditions — maximum concentration, allowed product types, required warning statements, or limits on who the product may be sold to. This is the list that catches most brands, because an ingredient being legal is not the same as it being legal at the level you want.

**Positive lists.** For certain functional categories — colourants, preservatives and UV filters — only substances that appear on the approved list may be used, each with its own conditions. If your supplier proposes a preservative or a pigment that is not on the list, it cannot be used, regardless of how safe it may be in general.

**Everything else.** Ingredients not named anywhere are generally usable if they are safe for the intended purpose, which puts the burden of justification on the manufacturer and the product safety assessment.

All of this should be treated as orientation rather than authority. Lists are amended, and only the Thai FDA can confirm the current position for a specific substance in a specific product type.

The Ingredient Families That Cause the Most Problems

In practice, a small number of categories account for most of the surprises during **formula development**.

**Skin lightening actives.** This is the single most common friction point for brands targeting Asian markets. Several of the most historically popular lightening agents are prohibited in cosmetics outright, and others are permitted only within tight limits or only in specific product types. A brand that builds its entire positioning around aggressive brightening before checking the actives is setting up an expensive reversal.

**Corticosteroids and pharmaceutical actives.** Prohibited in cosmetics. They occasionally appear in unregulated products, which is exactly why enforcement in this area is active.

**Preservatives.** Only approved preservatives at approved levels may be used, and the approved level is often lower than a formulator would prefer for a challenging formula. This interacts directly with packaging: an airless pump protects a formula in ways a wide-mouth jar does not.

**UV filters.** Sunscreen actives come from a defined list, and the permitted set differs between Thailand, the EU, the US and elsewhere. A sunscreen formulated for one market may not be sellable in another without change.

**Botanical extracts.** Usually straightforward, but some plant materials carry restrictions, and standardisation varies enormously between suppliers.

**Fragrance allergens.** Certain fragrance components require declaration above set thresholds, which affects your label as much as your formula.

Why Claims Change Which Rules Apply

A point many founders miss: the same jar of cream can be a cosmetic or something more heavily regulated depending on what you say about it.

Cosmetic products are, by definition, for cleansing, beautifying, altering appearance or keeping the body in good condition. Once a product claims to treat, cure or prevent a condition, or to affect the structure or function of the body, it drifts toward the therapeutic category — with a completely different approval pathway, evidence burden and timeline.

This has concrete consequences:

• A moisturiser that says it hydrates is a cosmetic. One that says it treats eczema is not.
• A cleanser for oily skin is a cosmetic. One that claims to cure acne is making a therapeutic claim.
• A shampoo that reduces the appearance of flaking sits differently from one claiming to treat a scalp condition.

The practical discipline is to write your intended claims at the same time as the brief, not after the formula is finished. Share them with your manufacturer and ask whether the formula supports them and whether the claim is permissible for a cosmetic. Changing a claim on a slide is cheap; changing it after you have printed packaging and built a campaign is not. Confirm borderline cases with the Thai FDA rather than reasoning by analogy from a competitor's label — their label may itself be wrong.

Formulating for Several Markets at Once

Most brands do not stay in one country, and ingredient lists are not identical across markets. Planning for this early is cheaper than reformulating later.

The common approach is to formulate to the strictest relevant standard among your target markets, then confirm compliance in each. Where a single formula cannot satisfy every destination — sunscreen is the classic example — you accept market-specific variants deliberately rather than discovering the need by accident.

Questions worth settling at the brief stage:

• **Which markets in the first two years?** Not every market you dream of; the realistic ones.
• **Does any target market require a different preservative or UV filter set?**
• **Will you need halal certification?** That reaches into ingredient origin, processing and sometimes the production line itself, and it is far easier to design in than to add.
• **Does any market restrict specific actives you are building the product around?**

An experienced **OEM manufacturer in Thailand** will have navigated these differences repeatedly and can usually flag the conflicts in the first technical conversation. Ask directly which of your target markets they have exported to, and whether the proposed formula has gone to any of them before. A manufacturer who has shipped your category to your destination has already solved problems you have not yet met.

Documentation That Proves Compliance

Compliance is not only about what is in the formula. It is also about being able to show what is in it. Assemble the following for every product.

• **Full quantitative formula**, held by the manufacturer and available to the responsible party.
• **INCI ingredient list** in the correct descending order, which is what appears on the label.
• **Raw material specifications and certificates of analysis** from the ingredient suppliers.
• **Product safety assessment**, prepared by a qualified assessor.
• **Stability and compatibility testing**, confirming the formula behaves in its chosen packaging over its claimed shelf life.
• **Microbiological challenge testing**, confirming the preservative system actually works in the final formula and pack.
• **Notification record**, obtained before the product is placed on the market.
• **Label artwork** carrying the required mandatory information.

Two points matter commercially. First, packaging is part of compliance, not separate from it. A formula validated in a tube is not automatically validated in a jar, so settle packaging before you finalise stability work rather than after. Second, keep copies of everything yourself. If you later move production, documents held only by your previous manufacturer are difficult to recover, and rebuilding them is slow.

Working Through This With Your Manufacturer

The regulatory work does not have to be your expertise, but the decisions behind it are yours. A sequence that keeps things moving:

1. **Write the brief with claims included.** Product type, target customer, the claims you intend to make, the markets you intend to enter. 2. **Ask for an early feasibility read.** Before samples, ask the manufacturer to flag anything in the brief that conflicts with ingredient rules in your target markets. This conversation costs nothing and saves the most time. 3. **Settle packaging in parallel with the formula.** Preservation, stability and the pack are one system, not three decisions. 4. **Approve samples against the brief**, including the claims. Test in realistic conditions, not just on the back of your hand in an air-conditioned room. 5. **Complete safety and stability work** before committing to printed packaging. 6. **File the notification** and keep the full document pack.

Where minimum order quantity matters to your planning, the standard reference point in contract manufacturing is 1,000 units per SKU, and that figure should inform how many variants you launch with. A founder who wants to **start your own brand** with eight shades will find the compliance and inventory load very different from one launching three focused products. For anyone approaching **skincare OEM** for the first time, the most useful discipline is simply this: raise the regulatory question at the brief stage, when it is a conversation, rather than at the sampling stage, when it is a setback.