The supplement company purchased their own products on Amazon and identified three separate problems:
Expiration Dates Changed - Sometimes the products were genuine but expired. The seller had changed the expiration dates on the packaging.
Poor Storage Conditions - Warehouses, where the products were stored, had not controlled the temperature. After sitting in the high heat for a prolonged period of time the quality degraded - meaning it was less effective.
Counterfeit Products - The third problem was sometimes the company’s packaging had been counterfeited and the product inside was not theirs!