When sourcing Indomethacin, buyers must prioritize Pharmaceutical Grade (API) or finished dosage forms that comply with international pharmacopoeias such as USP (United States Pharmacopeia), BP (British Pharmacopeia), or EP (European Pharmacopoeia). Key technical parameters include a purity level of ≥98.5%, strict limits on heavy metals (≤20ppm), and controlled residual solvents. For finished products like capsules or suppositories, ensure dissolution rates and content uniformity meet regulatory benchmarks.