The U.S. Food and Drug Administration is cautioning consumers not to purchase fraudulent products (tablets, teas, tonics, black salves and creams) that claim to prevent or cure various cancers.

The heath agency said it had already sent warning letters to 23 U.S. companies, 1 Canadian, and 1 Australian company asking them to stop selling some 125 products promoted for curing, treating, or preventing cancer.

David Elder, director of FDA’s Office of Enforcement in the Office of Regulatory Affairs, said the FDA has not even approved these products and their selling is “unkind to the patient who is seeking help.”

The FDA cited some of the most fraudulent claims found on these products’ labels: “Treats all forms of cancer,” “Causes cancer cells to commit suicide!,” “80% more effective that the world’s number one cancer drug,” “Skin cancer disappear,” “ Target cancer cells while leaving healthy cells alone,” Shrinks malignant tumors,” “ Avoid painful surgery, radiotherapy, chemotherapy, or other conventional treatment.”

Not only these products do not cure cancer like their labels read, but they may be unsafe or might interfere with other cancer treatments, or may be used instead of medically acceptable treatment. Moreover, the FDA fears that patients with cancers might refuse seeking proper treatment using instead these “miraculous” cures.

Many of the commercialized products are promoted on the Internet and contain ingredients such as bloodroot, shark cartilage, coral calcium, cesium, ellagic acid, Cat’s Claw, and herbal tea, and mushrooms such as Agaricus Blazeii, Shitake, Maitake, and Reishi.

People already using such products are urged to immediately talk to their doctor about interrupting their use and seek proper medical attention if they’ve experienced any side effects while taking the products.

The FDA initiative is part of the agency’s effort, in collaboration with the Federal Trade Commission (FTC) and Canadian government agencies, to prevent products from reaching consumers and follows consumer complaints. Earlier this year, the FTC sent similar warning letter to 112 websites promoting deceitful products asking them to stop selling them.

The companies not complying with the warning letters are subject to enforcement action up to including seizure of illegal products, injunction, and possible criminal prosecution.