The constitution of Chile does protect free speech. The Constitution guarantees the freedom to emit opinions and to inform without previous censorship in any way and through any media. The above free speech language does not refer specifically to commercial speech. Commercial speech is afforded the same level of protection as regular speech.
Freedom of speech is generic, and freedom of commercial speech is contained within it.
The Courts and Legislative branch are primarily responsible for ensuring that commercial speech is protected. The Courts deal with all cases brought before them by affected parties who feel that their rights to freedom of speech have been transgressed. The Parliament must respect this guarantee when studying and dictating new laws.