Long regarded by scientists as a form of modern-day snake oil, homeopathic products are treated as drugs under law, but not supported by modern science. Most remedies contain heavily diluted drugs, vitamins and minerals. Popular homeopathic brands include Zicam Allergy Relief and Cold-Eeze.

"We respect that some individuals want to use alternative treatments, but the FDA has a responsibility to protect the public from products that may not deliver any benefit and have the potential to cause harm," FDA Commissioner Dr. Scott Gottlieb said in a statement.

Homeopathic products are similar to dietary supplements, in that the FDA does not review their safety or effectiveness before they are sold. But unlike supplements, homeopathic medicines can state that they are intended for specific medical symptoms and conditions, similar to drugs.

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