Is Cheese Made with Animal Rennet Considered Halal?

For millions of Muslims worldwide, a simple trip to the cheese aisle raises a question that has occupied Islamic scholars for centuries: is cheese made with animal rennet considered halal? The answer is not a straightforward yes or no. It depends on which school of Islamic jurisprudence you follow, the source of the rennet, and how the animal was slaughtered.

This guide breaks down the scholarly positions of all four Sunni madhabs, explains what rennet actually is, identifies which types of cheese are safe for Muslim consumers, and provides a practical checklist for choosing halal cheese with confidence.

What Is Rennet and Why Is It in Cheese?

Rennet is a complex of enzymes — primarily chymosin — that coagulates milk, separating it into solid curds and liquid whey. This coagulation process is the foundation of cheesemaking. Traditional rennet is extracted from the stomach lining of young ruminant animals (calves, lambs, or goats), specifically from the fourth stomach (abomasum), where the enzyme is naturally produced to help the animal digest its mother’s milk.

The halal concern arises because most commercial animal rennet comes from calves that may not have been slaughtered according to Islamic rites (zabiha). If the animal was not slaughtered in the name of Allah by a Muslim or a Person of the Book, its byproducts — including rennet — fall under scrutiny.

The Four Madhabs on Animal Rennet

Islamic scholars are divided on this issue, and the disagreement runs deep. Here is what each of the four major Sunni schools of thought holds:

Hanafi School

The Hanafi position is the most permissive. Hanafi scholars, including Imam Abu Hanifah himself, hold that rennet from a non-zabiha animal is tahir (pure) and halal to consume. Their reasoning centers on the biological nature of rennet: since no blood circulates through the stomach lining where rennet resides, rennet is not considered a “living” part of the animal. Therefore, it does not “die” when the animal dies, and the prohibition on consuming dead animals (maytah) does not apply to it.

This position is supported by the reported practice of the Prophet’s companions (Sahabah), who ate cheese made by Zoroastrians — people who did not slaughter animals according to Islamic rites — without objection.

Maliki School

The Maliki school takes a restrictive position. Maliki scholars consider rennet from an animal that was not properly slaughtered to be najis (impure). Their reasoning is that the rennet is contained within the stomach, which is part of the dead animal (maytah), and therefore takes on the ruling of the whole — impurity. Cheese made with such rennet would be impermissible.

Shafi’i School

The Shafi’i school also considers rennet from non-zabiha animals to be najis and therefore haram. Shafi’i scholars argue that when an animal dies without proper Islamic slaughter, all of its parts become impure, including the rennet. The milk remaining in the stomach would also be considered impure by contact. This is the dominant Shafi’i position, though some later Shafi’i scholars have noted the Hanafi position as a valid point of legitimate scholarly disagreement (ikhtilaf).

Hanbali School

The Hanbali school has two narrations from Imam Ahmad ibn Hanbal, reflecting the genuine difficulty of this question:

• First narration: Rennet from non-zabiha animals is pure and cheese made with it is permissible — aligning with the Hanafi view.
• Second narration: Rennet from such animals is impure — aligning with the Maliki and Shafi’i view.

Many later Hanbali scholars have leaned toward the permissive opinion, but the school formally acknowledges both positions.

The Prophetic Precedent

A key piece of evidence cited by those who permit animal rennet cheese is the hadith narrated about the Prophet Muhammad (peace be upon him) eating cheese. While the authenticity and interpretation of specific narrations are debated, scholars on the permissive side point to the established practice of the Sahabah consuming Persian and Roman cheese without inquiring about the slaughter method of the animals whose rennet was used.

Types of Rennet: A Practical Breakdown

Understanding the different types of rennet available today is essential for making informed choices:

Key fact: Today, approximately 90% of cheese produced in the United States is made using Fermentation-Produced Chymosin (FPC), not animal rennet. This means the vast majority of American cheese is made with an enzyme that all Islamic schools consider halal.

Cheeses That Typically Use Animal Rennet

Certain traditional European cheeses are almost always made with animal rennet due to protected designation of origin (PDO) regulations:

• Parmigiano-Reggiano — Italian law requires calf rennet
• Grana Padano — also requires animal rennet by PDO rules
• Gruyere — traditionally uses animal rennet
• Pecorino Romano — uses lamb rennet
• Manchego — traditionally uses animal rennet
• Gorgonzola — typically animal rennet

If you follow the Shafi’i, Maliki, or the restrictive Hanbali opinion, these cheeses should be avoided unless you can confirm the source is halal-slaughtered.

How to Identify Halal Cheese

Here is a practical checklist for Muslim consumers:

1. Look for halal certification — This is the most reliable method. Brands certified by IFANCA, ISWA, or other recognized bodies have verified the rennet source.
2. Check the label for “microbial rennet” or “vegetable rennet” — These are always halal regardless of school.
3. Look for “enzymes” on the ingredient list — If the label says “enzymes” without specifying animal or microbial, contact the manufacturer to confirm the source.
4. Choose FPC-based cheese — Most major American and Australian cheese brands now use Fermentation-Produced Chymosin.
5. When in doubt, choose vegetarian cheese — Cheese labeled “suitable for vegetarians” does not use animal rennet.

Halal-Friendly Cheese Brands

Several widely available brands use microbial or vegetable rennet and are suitable for Muslim consumers:

• Tillamook — uses microbial enzymes in most varieties
• Cabot — many varieties use microbial rennet (check individual products)
• Organic Valley — offers microbial rennet options
• Sargento — some products use microbial enzymes
• Store-brand cheese — Many supermarket brands (Kirkland, Great Value, 365) use FPC or microbial rennet

For full certainty, always look for explicit halal certification from a recognized Islamic authority.

Frequently Asked Questions

Is Parmesan cheese halal?

Traditional Parmigiano-Reggiano is made with calf rennet and is not halal according to the Shafi’i, Maliki, and restrictive Hanbali opinions. The Hanafi school considers it permissible. However, generic “Parmesan-style” cheese sold in the US often uses microbial rennet or FPC, which is halal according to all schools. Check the label or contact the manufacturer.

Is rennet from a pork source ever used in cheese?

Pork-derived rennet (pepsin) is rarely used in modern commercial cheese production, but it does exist. Cheese made with pork pepsin is haram according to all Islamic schools without exception. Always verify the source of enzymes if the label is unclear.

Can I eat cheese if I do not know the rennet source?

This depends on your school. Hanafi scholars generally permit consuming cheese when the rennet source is unknown, based on the principle of original permissibility (istishab). Shafi’i and Maliki scholars advise avoidance when the source is doubtful, applying the precautionary principle. IslamQA.info recommends avoiding cheese of unknown rennet source due to the scholarly disagreement and the doubt involved.

What is microbial rennet, and is it always halal?

Microbial rennet is produced by fermenting specific strains of fungi (such as Rhizomucor miehei) or bacteria. It contains no animal products and is considered halal by all Islamic schools of jurisprudence, provided no haram substances are used in the fermentation process.

Is mozzarella cheese halal?

Most commercially produced mozzarella in the US uses microbial rennet or FPC and is halal. Traditional Italian mozzarella di bufala may use animal rennet. Check the specific brand and product label.

Are cheese-flavored snacks halal?

Cheese-flavored snacks (chips, crackers, etc.) may contain enzyme-modified cheese or cheese powder derived from animal rennet sources. Additionally, they may contain other non-halal ingredients like animal-derived flavoring or alcohol-based carriers. Always check the full ingredient list or look for halal certification.

For more guidance on halal dietary principles, read our articles on halal food rules, how to read a halal food label, and whether ice cream with emulsifiers is halal. You can also explore what makes food halal or haram in Islam for a broader overview.