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Based on limited metadata, the FDA issued a Warning Letter to Alternative Laboratories on September 18, 2019, regarding dietary supplement products. Without access to the full letter text or specific subject line, the precise nature of the violations cannot be determined from the available information. The warning falls under FDA's regulatory authority over dietary supplements, though the specific issuing office is not identified in the metadata provided. To understand the detailed violations and required corrective actions, the complete Warning Letter would need to be reviewed.