Updated EU REACH regulation is tightening control over CMR hazardous substances used in hair-goods dyeing and chemical treatment processes. All imported human-hair wigs and hair extensions sold within EU territory need to complete chemical-risk documentation. Suppliers must provide traceability records for dyeing agents and auxiliary raw materials. Non-compliant batches will face customs detention. Chinese exporters are accelerating formula optimization and third-party testing to adapt to the new compliance requirements of European markets.