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These products—some meant to be injected directly into the bloodstream—are illegal and pose “serious risks to patient health,” the FDA said in an announcement. The agency also made public the warning letters it sent to each of the sellers, all dated June 11.

“These unapproved injectable drugs are particularly concerning because they inherently present greater risks to patients because of how they are administered,” Donald Ashley, director of the Office of Compliance in the FDA’s Center for Drug Evaluation and Research, said in a statement. “These products are further concerning given that they are labeled to contain potentially toxic ingredients intended for injection directly into the body. These warning letters reflect our continued commitment to patient safety.”