There are many effects of publicity. Almost any effect you want, the seller can say the improvement effect, but there is no such magic thing at all.

Most of these things are food production licenses, some are candy, some are drinks, and some are jelly. Many licensed packages dare not indicate their efficacy, and those without licenses dare, because they can't find a company, which may be a small workshop. You can't trust the efficacy of all propaganda, so be careful.