The card refers to the packaging: the recommended daily amount and the method of use are stated there. The card does not speak of combining it with other B vitamins. Warnings: the recommended daily amount must not be exceeded; during pregnancy and breastfeeding a doctor should be consulted; the supplement does not replace a varied diet.
General information (not a manufacturer's instruction): when taking several vitamin supplements, it is worth checking the total dose on the packagings or together with a doctor.