Quick Answer
Whey is halal if the rennet used to curdle the milk is microbial or from a halal-slaughtered animal.
Detailed Explanation
What is it?
Whey / Whey Protein is a popular ingredient.
Why it may be doubtful
Whey is the liquid remaining after milk has been curdled. The process requires rennet. If microbial or plant-based rennet is used, it is 100% halal. If animal rennet is used, the animal must be halal-slaughtered. Always look for a halal certification or vegetarian label.
Fiqh considerations
General Islamic dietary principles require that ingredients be free from non-Zabiha meat, insects, and intoxicating alcohol.
Practical advice
Always read the latest ingredient label or use the allhalal.info scanner app, as manufacturers frequently change their recipes. Look for certified vegan or halal symbols where possible.
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