Skip to content

Is Whey Protein Halal? Rennet, Enzymes and Labels

Short answer Depends

It depends on how the cheese was made. Whey is the liquid left after milk is curdled for cheese [1], so the question is the enzyme used. Microbial or plant enzymes are accepted as halal [2][4]. Animal rennet from non-zabiha calves is debated [3], and pig enzymes are not accepted [4]. If you're unsure, ask a scholar you trust.

Last verified:

What the schools of thought say

SchoolViewSource
Hanafi (Imam Abu Hanifa) and Maliki (Imam Malik) Rennet from a halal animal that was not slaughtered Islamically is clean and pure, so cheese and whey made with it are permissible. [3][4]
Hanafi (Imam Abu Yusuf and Imam Muhammad) Such rennet is impure. Darul Ifta Birmingham advises following this more cautious view for cheese made in non-Muslim countries. [3]
Darul Iftaa (Mufti Ebrahim Desai) Microbial rennet and rennet from properly slaughtered halal animals are permissible; rennet from pigs is not. For unslaughtered halal animals, the Hanafi fatwa follows Abu Hanifa's permissive view. [4]
IFANCA (US certifier) Microbial and plant enzymes are halal; animal enzymes are halal only when taken from halal-slaughtered animals. [2]

Where whey comes from

Whey is a by-product of cheesemaking. US rules define it as the liquid left after the curd is separated from milk, cream, or skim milk [1]. US rules also separate sweet whey, in which little milk sugar has turned into lactic acid, from acid whey, which comes from curds formed by acid or by heavy lactic fermentation [1].

Whey protein powders (concentrate, isolate, hydrolysate) are made by filtering and drying that liquid. The milk itself is halal. The halal question comes from what was used to curdle the milk in the first place. That is why two whey powders that look identical can have different halal status.

The rennet question

To make many cheeses, producers add rennet or similar enzymes. These can come from:

  • Microbes or plants: accepted as halal [2][4].
  • Calves or other halal animals slaughtered Islamically: accepted as halal [2][4].
  • Halal animals not slaughtered Islamically: debated. Imam Abu Hanifa and Imam Malik held this rennet is pure; Imam Abu Yusuf and Imam Muhammad held it is impure [3]. Some Hanafi muftis give fatwa on Abu Hanifa's view [4], while others prefer the cautious view [3].
  • Pigs: not accepted [4].

IFANCA, a major US certifier, applies the rule that animal enzymes are halal only from halal-slaughtered animals [2].

Acid whey can avoid the rennet question when the curd was formed by adding acid directly [1]. Most commercial whey protein, though, comes from cheese whey, and labels almost never name the enzyme. HalalLookup reports these views and does not rule between them.

What else is in a protein powder

Even if the whey itself is fine, check the rest of the tub:

A halal mark on the label means a certifier has checked the whey source, enzymes, and other ingredients together.

How to choose a whey protein

  1. Look for a recognized halal mark on the tub. This is the clearest answer.
  2. If there is no mark, contact the brand and ask what enzymes were used to make the cheese the whey came from: microbial, plant, or animal.
  3. Consider plant proteins such as pea or soy if you want to avoid the question entirely.

If you follow Abu Hanifa's view on rennet [3][4], non-certified whey from animal rennet may still be acceptable to you, as long as no pork enzyme is involved. If you follow the stricter view, choose certified or microbial-enzyme products. If you're unsure, ask a scholar you trust.

Related: rennet, cheese, and enzymes.

Frequently asked questions

Is whey haram?

Whey is not haram by itself; it is a milk product [1]. The question is the enzyme used to make the cheese. Microbial, plant, or halal-slaughtered animal enzymes are accepted [2], while pig enzymes are not [4].

Is whey protein isolate halal?

The same rules apply to isolate, concentrate, and hydrolysate, because all are made from cheese whey. Check for a halal mark or ask the brand which enzymes were used [2]. Then check flavors and other added ingredients.

Is whey made with animal rennet halal?

Scholars differ. If the rennet came from a halal animal that was not slaughtered Islamically, Abu Hanifa and Malik considered it pure, while Abu Yusuf and Muhammad did not [3]. Rennet from pigs is not accepted [4].

Does kosher whey mean halal?

Not necessarily. Kosher and halal rules overlap but are not the same, especially on animal-derived ingredients. A halal mark is the more direct sign that the enzymes meet halal rules [2]. See our kosher vs halal guide.

Sources

  1. 21 CFR 184.1979 - Whey · Legal Information Institute, Cornell Law School (US Code of Federal Regulations) · accessed
  2. Not as Simple Anymore! · IFANCA · accessed
  3. Gelatine and Animal Rennet (Shaykh Mohammed Tosir Miah, Darul Ifta Birmingham) · IslamQA.org · accessed
  4. List of ingredients in ready food said to be haram (Darul Iftaa, Mufti Ebrahim Desai) · IslamQA.org (Askimam) · accessed