E621 (monosodium glutamate) is normally compatible with a halal ingredient assessment when it is produced by the modern plant-carbohydrate fermentation process. The US FDA says MSG is now made by fermenting starch, sugar beets, sugar cane or molasses, and Ajinomoto describes its own process as fermentation of plant-based sugar cane, sugar beet, cassava or corn. That evidence establishes the usual source, not a universal product certificate; verify the exact manufacturer or current halal record when certification is required.
How MSG is made
Monosodium glutamate is the sodium salt of glutamic acid, an amino acid found naturally in tomatoes, parmesan, mushrooms and seaweed. Industrially it is produced by bacterial fermentation: Corynebacterium glutamicum is grown on a carbohydrate medium of sugar cane molasses, sugar beet or tapioca starch, and excretes glutamic acid, which is then neutralised with sodium and crystallised.
The process is closer to how yoghurt or vinegar is made than to anything involving animals. The feedstock is plant. The organism is a bacterium.
Why the “MSG is pork” rumour needs product-level evidence
The word “fermentation” does not by itself reveal every culture input or processing aid, which is why product certification can still matter even when the final additive has a straightforward chemical identity. It is also why an old claim about one production process should not be turned into a permanent verdict for E621 worldwide.
LPPOM MUI has published a brand-specific clarification rejecting a circulating pork claim about named Indonesian seasonings after material tracing. The certificate details in that clarification were time-limited, so use Indonesia’s current BPJPH Cek Produk Halal search for a product you are buying now rather than relying on an old screenshot or forwarded message.
Do halal certifiers approve MSG?
| Source | What it establishes |
|---|---|
| US FDA | Modern MSG is produced by fermenting starch, sugar beet, sugar cane or molasses |
| Ajinomoto Group | Its current process uses plant-based sugar cane, sugar beet, cassava or corn |
| LPPOM MUI clarification | A named Indonesian product claim was investigated and rejected; this is not a certificate for all MSG |
| Current BPJPH record | Whether the exact Indonesian product and certificate are active now |
The useful question is therefore not “is every E621 pork?” but “what production and certification evidence applies to this product?”
What to watch for in savoury products
MSG rarely travels alone. It is usually paired with ribonucleotide enhancers, and those are the genuine Mushbooh flags:
- E627 disodium guanylate. Can be from fish, yeast or meat
- E631 disodium inosinate. Can be from fish, meat or fermentation; from pork it would be haram
- E635 disodium ribonucleotides. A blend of E627 and E631, same question
If a crisp packet or instant noodle seasoning worries you, E631 is the code to look at, not E621. Also look at the flavouring: undeclared "natural flavouring" and meat extracts in savoury seasoning are a bigger real-world risk than the glutamate.
Names MSG appears under
- E621
- Monosodium glutamate / MSG
- Sodium glutamate
- Flavour enhancer (E621)
- Related salts: E620 glutamic acid, E622 monopotassium glutamate, E623 calcium diglutamate, E624 monoammonium glutamate, E625 magnesium diglutamate, all fermentation-derived and treated the same way
Note that yeast extract, Torula yeast, hydrolysed vegetable protein and autolysed yeast deliver a similar savoury effect through naturally occurring glutamates or nucleotides. They are not another name for E621. Plain yeast-derived ingredients are generally compatible by source, while a compound seasoning still needs its carriers, culture inputs and any separately declared E627/E631/E635 checked. The species and process should be confirmed rather than inferred from an internet rumour about “pork yeast”.
Reading a savoury seasoning label
Scan the barcode; E621 appears in the Found Additives list alongside every other code in the product. Because the app shows the full breakdown rather than a single verdict, you can see immediately whether a savoury product's flag comes from the glutamate (usually fine) or from an inosinate or an undeclared flavouring (worth investigating).
Frequently asked questions
Is MSG made from pork?
Modern MSG is generally made by fermenting plant carbohydrates. The FDA names starch, sugar beet, sugar cane and molasses, and Ajinomoto names plant-based sugar cane, sugar beet, cassava and corn for its process. Those sources do not support a blanket claim that E621 is made from pork. Product certification can still verify culture inputs and production controls.
Is E621 haram in Islam?
E621 made through the documented plant-carbohydrate fermentation route has no identified pork or animal source in that process. If your standard requires certified control of fermentation inputs and processing aids, match the exact product to a current halal record rather than relying on the E-number alone.
What about E631 in the same product?
E631 disodium inosinate is a separate additive and a genuine Mushbooh case, because it can be derived from fish, meat or fermentation. It is very commonly used alongside E621 in savoury seasoning. If you are checking a crisp or instant noodle packet, E631 deserves more attention than E621.
Sources and verification
This page uses current manufacturer information, regulator or certifier guidance, and primary references where available. Sources last checked 14 September 2026. Recipes, suppliers and certification can change, so confirm the exact pack sold in your country.
- US FDA — Questions and Answers on Monosodium Glutamate — official definition, modern plant-carbohydrate fermentation process and US labelling rules
- Ajinomoto Group — what MSG is and how it is made — first-party production description using plant-based sugar cane, sugar beet, cassava or corn
- LPPOM MUI — clarification of pork claims about named seasonings — certifier clarification based on material tracing; historical product records must not be treated as current certification
- BPJPH Indonesia — Cek Produk Halal — official current product, business and certificate-number search