Ajinomoto (MSG): Myths, Facts, How Much to Use and Who Should Skip
“Ajinomoto se bal jhadte hain.” “It damages the brain.” “Chinese restaurants give you headaches.” You’ve heard all of these at a family table. Some of it is fear built on very little, and a smaller part deserves a fair hearing.
What Ajinomoto actually is
Ajinomoto is a Japanese company name that became the everyday word for its most famous product: MSG, monosodium glutamate. On a label it’s E621 or “flavour enhancer”.
MSG is the sodium salt of glutamic acid, an amino acid. That sounds chemical until you realise glutamate is already in food you love: ripe tomatoes, aged cheese, mushrooms, yakhni made from bones, soy sauce, and even human breast milk. It’s what gives savoury food that deep, satisfying taste that the Japanese call umami.
Commercial MSG is made by fermenting starch or sugar (from sources like sugarcane, corn or tapioca), much the way vinegar, dahi or soy sauce are made by fermentation. Your body handles glutamate from MSG the same way as glutamate from a tomato.
The short version
- What: sodium glutamate, a fermented seasoning (E621)
- Regulators: considered safe at normal food use by major food agencies
- Sodium: about a third as much as table salt, weight for weight
- Home use: about ½ tsp for a 4 to 6 serving dish
- Who may skip it: people who notice reactions, strict low-sodium diets, babies’ food
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Ajinomoto (MSG) myths vs what’s fair to say
| You’ve heard | What’s fair to say |
|---|---|
| It causes hair fall | No good evidence links normal MSG use to hair fall. |
| It damages the brain | Dietary glutamate from food doesn’t simply pour into the brain; normal amounts aren’t shown to harm it. |
| It’s a synthetic chemical | It’s made by fermentation, and the same glutamate is in tomatoes and cheese. |
| “Chinese restaurant syndrome” is real for everyone | When people are tested blind, most don’t react. A small number may notice mild short-lived symptoms after large amounts. |
| It’s full of salt | It contains sodium, but less than salt. It can even help cut total salt a little. |
| Any amount is fine | Not quite. It’s a seasoning. Big doses on an empty stomach are exactly when people report discomfort. |
The headache story is worth understanding. It began with a letter. One letter to a medical journal in the 1960s, not a trial of any kind, and the name attached itself to Chinese food with more than a hint of prejudice. Later, when volunteers were given MSG or a dummy without knowing which, reactions were rare, inconsistent and mild. Food regulators including the US FDA and the European food safety agency consider MSG safe at the levels used in food. The EU agency did set a precautionary acceptable daily intake, which modest home use like the amounts below stays within, and which is a reminder that “safe” means “safe in sensible amounts”.
So what’s fair? Some people genuinely feel unwell after very salty, MSG-heavy restaurant meals, with flushing, headache or thirst. That may come from the MSG, the salt, the oil, the portion, or all of them. If you’re one of those people, you don’t need a study to give you permission to avoid it.
How much MSG to use at home
MSG is a seasoning. It tastes of little on its own (try a grain; it’s oddly flat and slightly sweet-salty). It deepens what’s already there. Too much tastes flat and cloying.
- Chicken corn soup, 1.5 litres: ¼ to ½ tsp, stirred in at the end.
- Chicken chow mein or egg fried rice, 4 servings: ¼ to ½ tsp in the sauce.
- Chicken manchurian, 500 g chicken: ½ tsp in the sauce.
- Salan or daal: it isn’t needed. A proper bhuna, tomatoes and a little yakhni do the same job.
- Cut the salt: when you add ½ tsp MSG, reduce salt by about ¼ tsp and taste.
A level teaspoon of MSG is about 4 to 5 g. If a recipe from a street stall calls for a tablespoon in a small wok, that’s the kind of amount behind the complaints.
Umami without the packet
For a Pakistani-Chinese dish without MSG, add 1 tsp soy sauce, 1 tbsp tomato paste cooked in oil for 1 minute, and 250 ml homemade chicken stock in place of water. Our yakhni recipe gives the ratios. A few dried mushrooms soaked and chopped also work.
Sodium: the part that matters for BP
MSG contains roughly 12 percent sodium by weight; table salt is about 39 percent. So weight for weight, MSG carries about a third of the sodium. Used in place of some salt, it can lower the total a little, but used on top of full salt, soy sauce and a packet masala, it just adds more.
That’s why the smart approach isn’t fear of MSG but counting everything. Our packet masala label guide shows the sodium maths, and sendha namak vs table salt clears up another common salt myth.
Desi kitchens were chasing umami long before anyone bottled it: bone yakhni simmered for hours, bhuna tomatoes, dahi, dried fish in coastal Balochistan, and slow nihari. In Unani cookery rich, long-cooked broths are treated as strengthening food for recovery. MSG is simply a concentrated form of a taste those old techniques built slowly. Neither is magic; the slow way just brings more nutrition along with the flavour.
Who may prefer to avoid it
People who notice reactions such as headache, flushing, palpitations or tingling after MSG-heavy meals can simply avoid it and see if things improve. Strict low-sodium diets (heart failure, kidney disease, resistant high blood pressure): count MSG as sodium and ask your doctor or dietitian whether it fits. Babies under 1: don’t add MSG or salt to their food, and keep seasoning very light for toddlers. Pregnancy and breastfeeding: normal food amounts aren’t considered harmful, but there’s no reason to add extra, and heavily salted restaurant food is worth limiting. Asthma: if you believe MSG triggers symptoms, avoid it and discuss it with your doctor. Any reaction with swelling of lips or throat, wheezing, or chest pain after a meal needs urgent care; don’t assume it’s “just MSG”.
Reading labels for hidden MSG
Look for: monosodium glutamate, E621, flavour enhancer (E621), and related enhancers like E627 and E631 (often paired with MSG in noodles and chips). Instant noodle sachets, crisps, stock cubes, chicken powder, and many packet masalas and “Chinese salt” packs contain it. Hydrolysed vegetable protein and yeast extract contain natural glutamates too.
Buying tip: MSG sold loose in unmarked bags at wholesale markets is hard to trace, and white crystals can look like other things, including salt or even washing powder in the wrong container. Buy sealed, labelled packs, keep them in a marked jar, and store them out of children’s reach.
More plain-spoken kitchen guides sit on our Desi Remedies page.
Questions people actually ask
Is Ajinomoto harmful to health?
At normal food amounts, food regulators consider MSG safe. Large amounts in very salty meals are where complaints happen.
Does Ajinomoto cause hair fall?
There’s no good evidence for that. Hair fall has many other causes worth checking.
Is MSG halal?
MSG itself is made by fermentation from plant sources. Many brands carry halal certification; check the pack.
Can children eat food with MSG?
Occasional normal amounts are generally fine for older children. Leave it out of babies’ food.
Is MSG safe in pregnancy?
Normal food amounts aren’t considered harmful. Keep salty, heavily seasoned restaurant meals occasional.
How much Ajinomoto should I put in chicken corn soup?
About ¼ to ½ tsp for 1.5 litres, and reduce the salt slightly.
Does MSG have more sodium than salt?
No, about a third as much weight for weight. It still counts toward your daily sodium.
What can I use instead of Ajinomoto?
Homemade chicken stock, soy sauce, cooked tomato paste or soaked dried mushrooms.