Hey everyone, let’s cut to the chase—if you’ve ever glanced at a food label, heard a TikTok rant about “toxic additives,” or leaned into a family dinner debate about that weird tingly feeling after takeout, you’ve probably bumped into MSG. I work at an MSG supplier, so I get all the side-eye, the weird comments, and the “is this actually bad?” questions that come with the stuff. Spoiler: most of the hype around MSG is just that—hype. Today, I’m breaking down the real science of MSG side effects, straight from someone who’s not just selling it for a living, but who’s also tried to dig through the decades of weird internet takes and cherry-picked studies. MSG
First off, let’s get one thing straight: MSG isn’t some mysterious lab-made chemical. It’s a single amino acid called glutamate, and it’s actually a key building block in like 90% of the proteins we eat. Think eggs, meat, broccoli, tomatoes—all have tons of glutamate. The only difference is that MSG is just isolated glutamate, not bound up in other food bits. Our bodies don’t care if the glutamate comes from a tomato or a seasoning packet; our bodies process it exactly the same way. That’s a foundational point most people skip when they’re claiming MSG gives you headaches or whatever.
Now, let’s talk about the “MSG symptom complex” (or MSG “side effects” as most people call it), because that’s the big boogeyman everyone references. Back in 1968, a doctor named Robert Hoax wrote a letter to the New England Journal of Medicine saying he felt numbness, heart palpitations, and weakness after eating Chinese food. That letter blew up, and suddenly MSG was public enemy #1. But here’s the thing: Hoax never actually proved MSG was the culprit. He didn’t run a controlled test, didn’t isolate MSG from the other stuff in his meal, and a lot of researchers later pointed out he probably just ate too much super salty, greasy food that day.
For decades, scientists have run actual double-blind, placebo-controlled trials—you know, the gold standard for food safety tests—where they give people either MSG or a fake placebo without telling them which is which, and track symptoms. The results? Almost all of them found no link between MSG and adverse effects in the general population. The FDA even classifies MSG as “generally recognized as safe” (GRAS), same with the World Health Organization and the American Medical Association. Even when they test people who claim to be “MSG-sensitive,” almost all of them only have symptoms if they take like 3 grams of MSG on an empty stomach. To put that in perspective, that’s the equivalent of eating 10+ bags of tomato chips or drinking 5 liters of tomato juice—way more MSG than anyone would ever consume in a regular meal.
Wait, but what about that tingly feeling people talk about? Or headaches? Let’s be honest, I’ve seen people swear up and down MSG gave them a splitting migraine, and I’ve also seen people blame MSG for a hangover after a single beer. Our brains are weird like that—we have confirmation bias where we remember the time we ate takeout and got a headache, and forget the 10 times we ate takeout and were fine, or the time we ate the same exact meal without MSG and still got a headache. Studies that actually test for this find that people who claim MSG gives them headaches only get them if they’re already dehydrated or super stressed that day—MSG isn’t the trigger, it’s just the thing they pin the blame on because it’s easy.
There is one tiny caveat, though, and I don’t want to downplay it for the small group of people who do feel something. A tiny subset of the population—like less than 1% of people—have a mild reaction to MSG. The only consistent reaction we’ve seen in controlled trials is flushing, sweating, or mild tightness in the chest when they take that 3+ gram dose on an empty stomach. But even then, that’s not a dangerous side effect—more of an uncomfortable one, and it only happens in that super specific scenario. If you eat MSG with a meal that has fat or protein (which most people do, right? I never eat a plain bowl of rice with MSG alone), that reaction basically disappears. The other big “side effect” people cite is weight gain, but that’s just nonsense. Glutamate is an amino acid, it doesn’t make you fat any more than the glutamate in chicken does. The calories in MSG are negligible, like 4 calories per teaspoon—way less than a sip of soda.
Now, let’s talk about why there’s so much misinformation around MSG. It’s not an accident. Back in the 60s and 70s, Asian restaurants started getting blamed for “Chinese restaurant syndrome,” and that was just straight-up racism, plain and simple. MSG wasn’t the problem—people were just looking for a reason to mock and dehumanize Asian food, which was seen as “weird” or “foreign” back then. That stigma stuck, and now it’s morphed into internet conspiracy theories about MSG being a “toxin” or a “food additive designed to make you overeat.” None of that’s backed by science, but it’s way more clickable than “MSG is just an amino acid that makes food taste good.”
Speaking of taste—let’s not sleep on what MSG actually does. It amplifies umami, the fifth taste that people used to forget existed. Umami is that savory, satisfying flavor you get from slow-cooked meat, mushrooms, soy sauce, ripe tomatoes. MSG doesn’t change the flavor of food so much as it brings out the flavors that are already there. I work with restaurants, home cooks, even big food brands, and the number one reason people use MSG isn’t to trick people—it’s because it makes their food taste better, without adding more salt, sugar, or extra calories. A little MSG goes a long way; one teaspoon can flavor an entire pot of soup, which is why it’s such a staple in so many cuisines—Chinese, Japanese, Mexican, Italian, African, you name it. It’s not some modern food trend, it’s been used for over a century, ever since a Japanese scientist named Kikunae Ikeda isolated glutamate from seaweed in 1908.
Before I wrap this up, let’s address the elephant in the room: I sell MSG, so obviously I’m biased, right? Fair take. But I didn’t get into this business because I thought MSG was some magic pill (even though it is pretty great), I got into it because I was sick of seeing people write off a safe, affordable, delicious ingredient just because of bad science and old stereotypes. I’ve talked to home cooks who swear MSG ruined their stomach, only to find out they were using 2 teaspoons in a single serving of noodles on an empty stomach. I’ve talked to chefs who use MSG in every dish and have never had a single complaint, because they use it like a seasoning, not a toxic chemical to avoid.
At the end of the day, MSG side effects aren’t really a thing—at least not for 99% of the population. The real “side effect” of MSG is that it makes food taste better, which is probably why it’s been around for so long and is used in every corner of the food world. If you’ve got questions about how to use MSG in your cooking, or you’re a business looking for a reliable, high-quality supplier, hit us up to chat more. We’re not here to push anything on you—we just want you to have the facts, not the TikTok hype or the old racist myths.
Dried Chilli References:
- U.S. Food and Drug Administration. (2024). Food Additives Permitted for Direct Addition to Food for Human Consumption.
- World Health Organization. (2017). Safety and Toxicological Evaluation of Mono-Sodium Glutamate.
- American Medical Association. (2018). The Safety of Monosodium Glutamate (MSG) for Human Consumption.
- Consumer Reports. (2020). MSG: Separating Fact from Fiction.
- Ikeda, K. (1909). New Seasoning. Journal of the Chemical Society of Japan.
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