What is the best possible way to verify claims a manufacturer makes about a supplement's safety and effectiveness?

To verify a manufacturer's claims about a supplement's safety and effectiveness, look for independent third-party testing results from reputable organizations like NSF International or USP. Additionally, review published clinical studies in peer-reviewed journals that evaluate the supplement's ingredients and effects. Consulting healthcare professionals can also provide insights into the supplement's credibility. Finally, check for any regulatory approvals or warnings from authorities like the FDA.