Beer and beer-based beverages in which the content of polyphenols and/or silicon is enhanced by the addition of polyphenols of Silybum marianum in a water-soluble form comprising their mixture with at least one basic amino acid or aminohexitol in the molar ratio of from 1:1 to 1:2 and/or by the addition of colloidal silicon dioxide in a water-soluble form and comprising its mixture with at least one basic amino acid or aminohexitol in the molar ratio of from 1:3 to 1:4. A method of modification of the content of these substances in beverages is also described.