A Code of Practice For Muslims in the West : Eating & drinking » Questions and Answers
Fatawa of Ayatullah al Uzama Syed Ali al-Husaini Seestani
191: Question: We are unaware of the ingredients of food sold in shops in Western countries: it might be free from those ingredients that are forbidden to us or it might contain them. Are we allowed to eat such items without looking into their ingredients, or inquiring about them? Or is that not allowed to us?
Answer: It is permissible [to eat such food] as long as it is not known that it contains meat, fat, and their derivatives that are forbidden to us.