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Are Enzymes Halal? Rennet, Pepsin, Lipase Explained

Short answer Depends

Enzymes are halal or not depending on their source. Enzymes made by microbes on a halal growth medium are widely accepted [3]. Enzymes from pigs are haram [4]. Enzymes from cattle that were not slaughtered Islamically are disputed among scholars [4][5]. US labels often just say "enzymes," so ask the maker. If you're unsure, ask a scholar you trust.

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What the schools of thought say

SchoolViewSource
Hanafi (Abu Hanifa) Rennet from an animal that was not Islamically slaughtered is pure, so cheese made with it is permissible. Darul Iftaa Chicago follows this view for US grocery cheese. [4][5]
Hanafi (Abu Yusuf and Muhammad) Rennet from such an animal becomes impure through contact with the stomach. One South African fatwa says all three imams would prohibit modern non-zabiha rennet. [4][5]
Shafi'i Rennet taken from an animal that was not properly slaughtered is impure in itself. [4]
SANHA (certifier) Accepts animal enzymes only from halal-slaughtered animals, and microbial enzymes only when the growth medium is halal-suitable. [3]
All schools Enzymes from pigs are haram, however they were made. [4]

What food enzymes are

Enzymes are proteins that speed up a reaction. Food makers use them to curdle milk for cheese, soften dough, break down starch and develop flavor. Only a tiny amount is needed.

The best-known food enzyme is rennet. US rules describe animal rennet as an extract of the fourth stomach of calves, kids or lambs. Its main enzyme is chymosin [1]. Other common enzymes include:

  • Pepsin, usually from pig stomachs, but also from cattle or microbes [3]
  • Lipase, from animals or microbes [3]
  • Pancreatin, from pig pancreas, used for strong cheese flavors [6]

The halal question is always the same: where did this enzyme come from?

Microbial and fermentation-made enzymes

Many enzymes today are made by fermentation. US rules allow chymosin produced by three microbes: a strain of E. coli, a yeast and a mold [1]. This is often called fermentation-produced chymosin (FPC). Industry estimates in 2012 put FPC in about 90% of US cheese [2].

Halal bodies generally accept microbial enzymes. SANHA accepts them when the growth medium is halal-suitable [3]. Darul Iftaa Chicago calls cheese made with microbial, plant or fermentation-made rennet halal [4].

Enzyme makers have also built microbial replacements for pig enzymes. One UK firm developed a microbial lipase to replace porcine pancreatin, aimed at halal and kosher cheese [6].

Why animal enzymes are disputed

For pig enzymes, there is no debate: they are haram [4].

For enzymes from cattle, sheep or goats, it depends on slaughter and on the school:

  • If the animal was slaughtered Islamically, its rennet is halal in principle [4].
  • If it was not, Abu Hanifa held the rennet pure, while his students Abu Yusuf and Muhammad held it impure [4][5]. The Shafi'i school also treats it as impure [4].

Today's fatwas split along the same lines. Darul Iftaa Chicago follows Abu Hanifa and accepts such rennet [4]. A South African fatwa says modern rennet comes from stomach lining and is not permissible from unslaughtered animals [5]. See our rennet page for more.

Quick guide by enzyme source

  • Microbial or fermentation-made: generally accepted when the growth medium is halal-suitable [3][4]
  • From halal-slaughtered cattle, sheep or goats: halal in principle [4]
  • From cattle not slaughtered Islamically: disputed between scholars and schools [4][5]
  • From pigs: haram in every view [4]

Reading US labels

US labels rarely tell you the source. A cheese may list "enzymes," "rennet," "microbial rennet" or "vegetable rennet." Labels don't separate FPC from other microbial rennet, and FDA does not require bioengineered chymosin to be labeled [2].

Here's what to do:

  • Look for halal certification. A certifier checks enzyme sources for you.
  • "Microbial" or "vegetarian" enzymes are a good sign, but not a guarantee.
  • Contact the company and ask whether its enzymes come from pigs, cattle or microbes. Arij Canada gives this same advice for pepsin and lipase [3].

Enzymes also appear in bread, juice, and whey protein.

Frequently asked questions

Are enzymes in cheese halal?

It depends on the source. Microbial and fermentation-made rennet is widely accepted [4]. Pig rennet is haram. Rennet from non-zabiha calves is disputed: some Hanafi scholars allow it, while others and the Shafi'i school do not [4][5].

Is pepsin halal?

Pepsin is usually taken from pig stomachs, but it can also come from cattle or microbes [3]. Pig pepsin is haram. SANHA accepts animal enzymes only from halal-slaughtered animals [3], so contact the maker to find the source.

Is microbial rennet halal?

Generally yes. Microbial and fermentation-produced rennet does not come from an animal stomach. SANHA accepts microbial enzymes when the growth medium is halal-suitable [3], and Darul Iftaa Chicago treats such cheese as halal [4].

What does "enzymes" mean on a food label?

It means the product uses one or more enzymes, but the label usually doesn't say where they came from. In US cheese, most rennet today is fermentation-made [2]. To be sure, look for halal certification or ask the company.

Sources

  1. 21 CFR 184.1685 Rennet (animal-derived) and chymosin preparation · Legal Information Institute, Cornell Law School · accessed
  2. Microbial Rennets and Fermentation-Produced Chymosin (FPC): How Vegetarian Are They? · The Vegetarian Resource Group · accessed
  3. Is pepsin and lipase okay to consume if they are integrated into a product? · Arij Canada (via IslamQA.org) · accessed
  4. Is Cheese from Grocery Stores Halal? The Islamic Ruling on Rennet · Darul Iftaa Chicago (via IslamQA.org) · accessed
  5. The preferred opinion in the Hanafi Mazhab regarding the cheese produced from rennet · Mufti Online (Darul Ifta Mahmudiyyah) · accessed
  6. Biocatalysts enzyme taps into new and growing Halal/Kosher cheese market · FoodNavigator · accessed