When sourcing private label cosmetics, quality is paramount. You must ensure the manufacturer follows Good Manufacturing Practices (GMP), specifically ISO 22716, which is the international standard for cosmetic production. Request a Certificate of Analysis (COA) for every batch to verify the chemical composition and purity. Additionally, check for Material Safety Data Sheets (MSDS) to understand the handling and safety profiles of the ingredients used. For high-end markets, prioritize suppliers offering paraben-free, cruelty-free, or vegan certifications to align with modern consumer preferences.