When sourcing pain relief creams, you must distinguish between analgesics, counter-irritants, and anti-inflammatories. Common effective ingredients include Menthol and Camphor (for cooling/heating sensations), Methyl Salicylate (topical aspirin-like effect), Capsaicin (for nerve pain), and increasingly, Arnica or CBD for natural inflammation relief. Ensure the supplier provides a Certificate of Analysis (COA) to verify the concentration of these active ingredients meets your market's efficacy standards.