Selecting beauty products requires a focus on ingredient safety, formulation stability, and brand positioning. Buyers should prioritize suppliers that provide MSDS (Material Safety Data Sheets) and COA (Certificate of Analysis) for every batch. For skincare, verify the concentration of active ingredients like Retinol, Vitamin C, or Hyaluronic Acid to ensure they meet marketing claims. For cosmetics, evaluate pigmentation, blendability, and long-wear performance through physical samples before committing to bulk orders.