Praise be to Allah.
Shaykh Ibn ‘Uthaymeen was asked about some leaflets which say that some soaps are made from pork fat, what do you think? He replied:
The basic principle is that everything that Allaah has created for us on this earth is halaal, because Allaah says (interpretation of the meaning):
“He it is Who created for you all that is on earth”
If someone claims that this is haraam because it is impure etc., then he has to provide proof. But there is no basis for believing every conjecture or everything that is said.
Liqa’ al-Baab al-Maftooh, 31/20.
And Allaah knows best.