Is Chymosin (Rennet) halal?
Chymosin (Rennet) is classified uncertain for halal use with Medium confidence. A coagulating enzyme used in some dairy-processing steps that may appear in trace excipients. Animal rennet is calf-derived; fermentation-produced chymosin is microbial.
Enzyme · Confidence: Medium
Also known as: rennet, recombinant chymosin
Uncertain Ask pharmacist
What it is
A coagulating enzyme used in some dairy-processing steps that may appear in trace excipients.
Source:EFSA
Why it's here
Rare in tablets; may appear in lactose or dairy-linked excipient supply chains.
See:EFSA
Why it may matter
Animal rennet is calf-derived; fermentation-produced chymosin is microbial.
Source:EFSA
Common sources
- Calf rennet
- Microbial fermentation
Questions to ask
- Was microbial rennet used in any dairy-derived excipient?
Reason codes
unknownSpecies
Evidence & citations1
AuditCommon questions
- Is Chymosin (Rennet) halal?
- RxHalal currently classifies Chymosin (Rennet) as UNCERTAIN (Medium confidence). Animal rennet is calf-derived; fermentation-produced chymosin is microbial. This is information only — not a fatwa or medical advice.
- What is Chymosin (Rennet) used for in medicines?
- A coagulating enzyme used in some dairy-processing steps that may appear in trace excipients. Rare in tablets; may appear in lactose or dairy-linked excipient supply chains.
- What are common sources of Chymosin (Rennet)?
- Common sources include: Calf rennet; Microbial fermentation. Manufacturers often do not disclose which source is used.
- Was microbial rennet used in any dairy-derived excipient?
- Ask your pharmacist or prescriber. RxHalal lists this because Chymosin (Rennet) is uncertain in our cited database.
Smallest set of questions to ask
AI suggests the fewest questions that would resolve the uncertainty.
Offline: the questions listed above are available without AI.