Consumers are offered rival claims by rival advertisers for rival goods. They are offered commentaries by would-be consumer advocates. They are also offered speech about these things by academic research and reports, as well as all the fruits of a free media. It is from all that circulating information that individual consumers make up their own minds about what they're going to believe and what they're going to use out of that information for their practical purposes. It is not any one source of information which is worthy, but the competition between them all.
Consumers have different needs from products.
They also have different information needs. There is no one label that is right. People want to know different things about different products. Just think of a world without advertising, with no product information, no labels, no contents lists, no memorable brand names, no invitations or suggestions for use. The words, of course, can't be in normal, everyday language because that might be persuasive, and the lettering must be standardized for size and typeface because some are more attractive than others.