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Based on limited metadata, this FDA Warning Letter issued in December 2021 concerns drug-related violations by Vasyl Melnyk, M.D. 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 drug regulatory authority, though the specific issuing office and violation count are not documented in this metadata. Additional details from the complete Warning Letter would be needed to identify the specific regulatory concerns and affected products.