The FTC enforces truth-in-advertising rules and regulates advertising of healthcare products. The FTC looks at ads in context to determine if claims are deceptive by express or implied messages. Advertisers must have evidence to substantiate claims before ads run. Disclaimers must be clear and conspicuous. Comparative ads are allowed if bases of comparison are identified. Endorsements must reflect honest opinions and advertisers must comply with FTC rules on different types of endorsements.