Often such products are nothing more than money-making things for their promoter. The re they produce are questionable, and some are dangerous to health.

　　To understand how these products can be legally promoted to the public, it is necessary? Understand something of the laws covering their regulation. If the product is a drug, FDA（Food Drug Administration）can require proof （证明）under the Food, Drug, and Cosmetic Act th safe and effective before it is put on the market . But if the product is a device, FDA. has no author to require premarketing proof of safety or effectiveness. If a product already on the marker danger to health, FDA. can request the producer or distributor to remove it from the a voluntarily, or it can take legal action ,including seizure （查封） of the product.

　　One notable case a few years ago involved an electrical device called the Relaxacisor, had been sold for reducing the waistline. The Relaxacisor produced electrical shocks to the ## through contact pads. FDA. took legal action against the distributor to stop the sale of the ## the grounds that it was dangerous to health and life.

　　Olwionsly, most of the devices on the maker never been the subject of court proceedings （法律诉讼）,and new devices appear continually, Before buying, it is up to the consumer to the safety or effectiveness of such items. ．It can be inferred that ads mentioned in the text are ______.

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