MSG symptoms are mild and typically resolve on their own within a few hours, but a few simple steps can help you feel better faster. Symptoms usually appear within two hours of eating foods containing monosodium glutamate and include headache, flushing, tingling, and muscle aches.
What MSG Symptoms Feel Like
The reaction, sometimes called MSG symptom complex, can produce a range of uncomfortable but generally harmless effects. The most common ones are flushing (a warm, red feeling in the face and neck), headache, numbness or burning in or around the mouth, tingling in other parts of the body, muscle aches, heart palpitations, and drowsiness. These symptoms vary from person to person. You might get just one, like a headache, or several at once.
The good news is that these effects are short-lived. Most people feel noticeably better within an hour or two, and symptoms rarely linger beyond a few hours total.
Immediate Steps for Relief
Drinking several glasses of water is the most commonly recommended step. Hydration helps your body process and flush the excess glutamate more quickly, which can shorten how long your symptoms last. Sip steadily rather than forcing down a large amount at once.
Beyond water, basic comfort measures go a long way. If you have a headache, rest in a quiet, dimly lit room. A cool compress on your forehead or the back of your neck can ease both headache and flushing. If you’re feeling drowsy, don’t fight it. Lying down and letting the reaction pass is often the fastest path to feeling normal again.
Over-the-counter pain relief can help with a persistent headache or muscle aches if they’re bothering you enough to want treatment, but most people find the symptoms fade before medication would even kick in.
The Role of Vitamin B6
Vitamin B6 acts as a helper molecule for enzymes that process neurotransmitters in the brain, and there is animal research suggesting it may counteract some of MSG’s effects on mood and the nervous system. In mouse studies, B6 supplementation prevented depressive effects from both single doses and long-term MSG exposure in young and adult animals. While human studies are limited, some people who report MSG sensitivity find that maintaining adequate B6 intake (through foods like poultry, fish, potatoes, and bananas) seems to reduce their sensitivity over time.
How to Avoid Reactions in the Future
If you consistently react to MSG, prevention is more effective than treatment. The challenge is that MSG doesn’t always appear on labels under its own name. It occurs naturally in several ingredients that food manufacturers use as flavor enhancers. When reading labels, watch for these terms:
- Hydrolyzed vegetable protein
- Autolyzed yeast
- Hydrolyzed yeast
- Yeast extract
- Soy extracts
- Protein isolate
Naturally glutamate-rich foods like tomatoes and aged cheeses also contain the same compound, though in forms that are less concentrated and typically cause fewer issues. If you find that even these foods trigger symptoms, you may need to moderate your intake of them as well.
At restaurants, especially those serving Chinese, Japanese, or other Asian cuisines, you can ask that no MSG be added to your food. Many restaurants are accustomed to this request. Fast food, processed snacks, canned soups, and seasoning blends are other common sources worth checking.
Keeping a Food Diary
Not everyone who suspects MSG is actually reacting to it. Other ingredients in the same meal, like high sodium content, certain preservatives, or even just overeating, can produce overlapping symptoms. Keeping a simple food diary for two to three weeks helps you identify patterns. Write down what you ate, roughly how much, and any symptoms that followed within two hours. Over time, this makes it much easier to pinpoint whether MSG is genuinely your trigger or whether something else is at play.
When Symptoms Need Medical Attention
Standard MSG symptoms, while annoying, are not dangerous. However, a true severe allergic reaction (anaphylaxis) to any food ingredient is a medical emergency. If you experience throat swelling, difficulty breathing, wheezing, a rapid or weak pulse, significant swelling of the tongue, or dizziness progressing toward fainting, call emergency services immediately. These symptoms go far beyond typical MSG sensitivity and require urgent treatment regardless of the suspected cause.