Thailand’s Food and Drug Administration (Thai FDA) has opened a further consultation on the regulatory impact analysis supporting proposed amendments to the country’s cosmetic ingredient requirements. The package covers 11 prohibited-list entries, seven restricted-substance entries, one preservative entry and two permitted sunscreen ingredients.

An earlier consultation on the proposed amendments ran from 9 June to 8 July 2026. The latest review is another stage in the rulemaking process and does not mean that the proposed restrictions are already in force.

Proposed Prohibited Ingredients

The prohibited-list proposal would add entries for certain petroleum, coal-tar and natural-gas derivatives containing at least 0.1% 1,3-butadiene. This entry is particularly broad because the draft identifies 57 CAS-numbered derivatives rather than a single substance.

Other proposed additions include Quaternium-15, trimethylolpropane triacrylate, phenacetin, benzophenone, miconazole and miconazole nitrate, bifonazole, clotrimazole, thiabendazole and tioconazole. If adopted, these substances would no longer be permitted as cosmetic ingredients under the conditions established in the final notification. ChemRadar

Quaternium-15 would also be removed from the permitted-preservative list. The related cosmetic-label warning requirement would consequently become unnecessary once the prohibition takes effect.

Restricted Substances and Sunscreens

The restricted-substance amendments affect salicylic acid, zinc pyrithione, verbena absolute, Acid Yellow 3 and butylated hydroxytoluene, among other entries. The proposal would reduce the permitted concentration of zinc pyrithione to 1% in rinse-off products and 0.1% in leave-on products, while Acid Yellow 3 would be limited to non-oxidative hair dyes at 0.5%.

The two sunscreen entries concern homosalate and benzophenone-3, also known as oxybenzone. Homosalate would be limited to non-aerosol facial sunscreens at 7.34%, while benzophenone-3 would be limited to face, hand and lip sunscreen products at 6%. ChemRadar

Implementation and Industry Impact

The June drafts proposed entry into force following publication in the Royal Thai Government Gazette, with a 180-day adjustment period for affected products. The adoption date and closing date of the latest consultation are not specified in the supplied update and should be confirmed through the Thai consultation portal.

Cosmetic notification holders, manufacturers, importers and ingredient suppliers should screen existing and developing formulations against the proposed entries. Particular attention should be given to supplier specifications for petroleum-derived ingredients, as compliance may depend on the presence and concentration of 1,3-butadiene rather than only the ingredient’s commercial name.

Products should not be withdrawn or reformulated solely on the assumption that the proposals are final. Companies should monitor Gazette publication and prepare to update formulations, safety assessments, Product Information Files and notification information if the amendments are adopted.