Is it obligatory to inform Muslims who sell spice products that contain pork and its bones that they must immediately stop selling them?

If you verify yourself or through the testimony of trustworthy individuals that foods contain forbidden ingredients, you must warn Muslims about them, due to the Almighty's saying: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression," and due to the Prophet's (peace be upon him) saying: "Religion is [sincere] advice... and for the leaders of the Muslims and their common folk." Start by warning Muslim merchants; if they do not respond, then warn the general Muslim public. It is not permissible for you to spread something whose authenticity you do not know.