Pheromones are classified as chemical substances, so compliance with REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) is essential for the EU market. For the US, ensure the supplier follows TSCA (Toxic Substances Control Act) regulations. If the pheromones are for cosmetic use, they must meet IFRA (International Fragrance Association) standards. Always ensure the supplier provides a comprehensive Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS) for customs clearance.