What should we do concerning the use of creams, cosmetics, soaps, and medicinal capsules that contain pig derivatives in their composition, given that the source of some compounds is unknown?

The fundamental principle is that everything Allah created for us on Earth is permissible, as Allah Almighty said: "He is the One who created for you all that is on Earth." So, whoever claims something is forbidden must provide proof, and no attention should be paid to mere superstitions or unsubstantiated claims.