Is rennet Halal?
Rennet is the enzyme that curdles milk so it can become cheese. Animal rennet comes from the stomach of young calves; microbial rennet is made by microorganisms, with no animal involved. Helal Scan treats rennet as Halal unless it comes from pork, and says so when the pack leaves the source open.
Short answer
In Helal Scan, yes, unless it comes from pork. Rennet from microbes, plants or a lawful animal such as a calf is treated as Halal. When the pack does not name the animal, the app shows the result with a note. Pork rennet is not Halal. The app follows the Hanafi position here; the other schools view animal rennet from an animal not slaughtered the Islamic way differently (see below).
What is rennet?
Rennet is an enzyme mixture that curdles milk: it splits the milk protein so that the milk separates into solid curd and liquid whey. The curd becomes cheese. Its main active enzyme is called chymosin.
Traditionally, rennet is taken from the fourth stomach of young ruminants that still drink milk, mostly calves. Today rennet is also made with microorganisms.
Animal, microbial and vegetarian rennet
- Animal rennet comes from the stomach of calves, less often lambs or kids. German packs write Kälberlab, Kalbslab or tierisches Lab. Rennet from pigs is Schweinelab.
- Microbial rennet is produced by moulds or bacteria, and fermentation-produced chymosin (FPC) belongs here too. No animal is involved. On the pack: mikrobielles Lab, Lab mikrobiellen Ursprungs, microbial rennet.
- Plant rennet is taken from thistle or fig, for example. It is rare.
- Vegetarian rennet is not a separate raw material: it is a name for microbial or plant rennet.
How labels name rennet, and what the app shows
Helal Scan reads the ingredient list and places each wording like this:
- microbial rennet, mikrobielles Lab, plant, vegetarian or Halal rennet, fermentation-produced chymosin: Halal, no note.
- Labaustauschstoff (rennet substitute): the app reads it like microbial rennet. Halal, no note.
- calf rennet, Kälberlab, Kalbslab, Rinderlab, Lammlab, Ziegenlab, Lab (Kalb): Halal, with the note "The rennet comes from a lawful animal (such as a calf). Consult a scholar if in doubt."
- rennet, Lab, Labferment, Labextrakt, animal rennet, tierisches Lab: the animal is not named. Halal, with the note "The pack doesn't say whether the rennet comes from pork or a lawful animal. In European cheese it is almost always from calves or microbes. Consult a scholar if in doubt."
- pork rennet, Schweinelab or Lab (Schwein): not Halal.
- The pack itself calls its rennet not Halal: Mushbooh, because it may then come from pork.
- without rennet, ohne Lab or ohne tierisches Lab: no rennet note.
The note does not change the result. Tapping it in the app shows how the schools see it (below). The app checks every other ingredient on its own terms: if a cheese also contains gelatine, the gelatine decides.
For cheese and skyr whose list names no rennet, a vegetarian or vegan mark answers the rennet question and no note appears. A vegetarian mark next to declared animal rennet contradicts the pack, so the app does not let that mark clear anything else on the list; the rennet itself is read as above.
What the schools say
On rennet the schools genuinely differ. The app's scholar overview lists them like this:
- Hanafi school (Abu Hanifa) + Ibn Taymiyyah: permissible. The enzyme in rennet does not "die" with the animal, so it stays pure and the cheese is fine. Condition: any source except pig. (IslamQA 2841)
- Maliki & Shafi'i (majority) + Hanbali: impermissible. Rennet from an animal not slaughtered Islamically is impure, so the cheese is impure. Condition: halal-slaughtered rennet. (Islamweb 347143)
- IslamQA (Sh. M. al-Munajjid): doubtful. Both views are valid; when the source is unknown, better to avoid out of caution. (IslamQA 115306)
- Microbial, plant and FPC rennet: Department of Islamic Development Malaysia, Halal Food Authority (UK) and most certifiers: permissible. Non-animal and fermentation-produced (FPC) chymosin are accepted as halal by the certification bodies. (HFA FAQ)
Helal Scan follows the position of Abu Hanifa on rennet. When you tap the note, the app shows: "Permissible according to Abu Hanifa (Hanafi school). The Maliki and Shafi'i schools, and one of two views in the Hanbali school, do not permit rennet from an animal not slaughtered the Islamic way. Rennet from pork is not permissible in any school." If you follow another school, look for microbial rennet or ask the maker.
Which cheeses are made with rennet?
Most semi-hard and hard cheeses are set with rennet, such as Gouda, Edam, Emmentaler, Bergkäse, Cheddar and Parmesan, and so is mozzarella. The ingredient list does not always name the rennet. So Helal Scan also shows the open-source note on a cheese whose list names no rennet. The app treats skyr like cheese.
For Parmigiano Reggiano and Grana Padano, the protected-origin rules require calf rennet. When the pack names the calf, the app shows the lawful-animal note; when it only says "rennet", the open-source note.
Cream cheese (Frischkäse), quark and cheesecake carry no rennet note: cream cheese and quark are set mainly with cultures and acid. If the pack still names rennet, as in "Frischkäse (Milch, Lab)", the note appears as for any other cheese.
And whey?
Whey and sweet whey powder are by-products of cheese making, so the rennet question comes with them. Helal Scan treats whey as Halal: it is a milk by-product, and a whey entry on a list cannot name the rennet behind it. Where pork or rennet is declared on the list, the rules above apply.
Common questions
What is animal rennet?
An enzyme from the stomach of young ruminants, mostly calves, that curdles milk for cheese making. German packs call it Kälberlab, Kalbslab or tierisches Lab.
Is animal rennet Halal?
In Helal Scan, yes, as long as it does not come from pork. The app follows the Hanafi position and shows a note when the pack does not name the animal. The Maliki and Shafi'i schools, and one of two Hanbali views, do not permit rennet from an animal not slaughtered the Islamic way.
Is microbial rennet Halal?
Yes. Microbial rennet contains nothing from an animal, and Halal certifiers accept it. The app shows no note for it.
What does the app do with Labaustauschstoff?
It reads it like microbial rennet and shows no note. If the list says pork next to it, the product is not Halal.
Is cheese Halal when the list names no rennet?
Semi-hard and hard cheese is usually made with rennet even when the list does not say so. If nothing else on the list is flagged, Helal Scan shows such a cheese as Halal with the note that the rennet source is open. Cream cheese and quark do not get this note.