Promoters of seasilver claim that the product is effective against cancer and other diseases. There is no scientific evidence, in the form of laboratory studies, animal studies, or clinical trials to support such claims.
In 2003 the Federal Trade Commission accused marketers of promoting Seasilver with false and fraudulent claims at which point the Food and Drug Administration seized nearly $5.3 million worth of the product. Seasilver USA has since agreed to comply with strict FDA and FTC guidelines regarding the marketing of its product.