Pepsin
9001-75-6 · PepsinCAS 9001-75-6
Pepsin is a protein-digesting enzyme used in cheesemaking, often blended with rennet, and in producing protein hydrolysates. It is obtained from the stomachs of pigs and cattle.
Where it is and isn’t permitted
| Jurisdiction | Status | Scope and limits | Citation |
|---|---|---|---|
| United States | Permitted | 21 CFR 184.1595retrieved 2026-09-07 | |
| Codex Alimentarius | Not listedDoes not appear on this jurisdiction’s permitted list. That is not the same as being prohibited. |
What it is made from
Extracted from the glandular layer of porcine or bovine stomachs. The porcine source is why pepsin raises a specific concern under halal and kosher rules beyond the general question of animal derivation.
- Not vegan
- Not vegetarian
- May raise a halal question
- May raise a kosher question
- CAS registry number
- 9001-75-6
Every name it appears under
2 recorded names. A label may use any of them.
CAS registry number
- 9001-75-6
As it appears in regulation
- Pepsin
Hazard reference values
No reference value for this substance in the sources we hold.
Evidence and how bodies read it
Studies, and the differing conclusions regulators drew from them, are curated by hand rather than machine-read, and none has been written for this substance yet.
Sources for this page
- ecfr retrieved 2026-09-07
Full licence terms and publisher details on Sources. How this page is built and updated: Method.
Machine-readable:/api/v1/additives/pepsin.json