Depends on the sourceDepends on the source, and most pepsin is from pigs. Pepsin from pigs is not halal. Pepsin from halal-slaughtered cattle or from microbes is halal.
Depends on the source means it can be made from plants, microbes or minerals, or from animals, including pigs. From plants, microbes or a halal-slaughtered animal it is halal; from pigs it is not. The label often does not say which, so look for a halal logo, a vegan label or a note on the source, or ask the maker.
What it is and where it comes from
Pepsin is a digestive enzyme taken from the stomach lining of animals, most often pigs. It is used with rennet in some cheese, to make some protein products, and in digestive supplements.
Where you find it
Some cheese, protein hydrolysates and digestive supplements.
What to look for on the label
Treat pepsin as pork unless the product carries a halal logo or says otherwise.
This is a guide, not a fatwa. Recipes change, so check the label, look for halal certification, and ask your local imam where scholars differ.
Learn to pray from zero
Revertly teaches new Muslims wudu and all five prayers step by step, with audio for every word. Cannot afford it? Ask for a free code