MSG and Allergic Reactions: What to Know Before Choosing Seasonings

“MSG allergy” is a phrase many people use. Some report headaches after eating at their favorite restaurant, while others experience a dry throat, heart palpitations, or chest tightness. But what exactly is MSG, and how closely are these symptoms connected to it? Let’s take a closer look.

What Is MSG?

Monosodium glutamate, or MSG, is a flavor enhancer that adds an “umami” taste and makes food more savory and well-balanced. Chemically, it is the sodium salt of glutamic acid—an amino acid naturally present in many foods, including tomatoes, mushrooms, and certain cheeses.

What Do People Mean by an “MSG Allergy”?

A group of symptoms reported after consuming large amounts of MSG is medically known as MSG Symptom Complex. Reported symptoms may include:

• Headache

• Facial flushing or a sensation of warmth

• Sweating

• Chest tightness or discomfort

• Heart palpitations

• Dry throat or numbness around the mouth

Several food-safety organizations consider MSG safe for the general population when consumed in appropriate amounts. However, some individuals report being particularly sensitive and may experience symptoms after consuming it, especially when their total intake accumulates across several meals during the day.

How to Identify MSG on Food Labels

MSG may not always appear on a label simply as “MSG.” It may be listed under its chemical name or food-additive code, such as:

• Monosodium glutamate

• E621 or INS 621

• A general term such as “flavor enhancer” without clearly identifying the specific additive

Carefully reading the ingredient list is therefore essential for determining whether a seasoning contains MSG.

For Those Looking to Reduce MSG Intake

• Choose seasonings with clearly listed ingredients that do not include MSG or E621.

• Use ingredients that naturally provide umami, such as dried mushrooms, kombu, or slow-simmered bone broth.

• Limit processed and ready-to-eat foods, which may contain added MSG to enhance flavor.

• If you have experienced symptoms after eating away from home, note which restaurants or types of dishes appear to trigger them. Consult a doctor if the symptoms occur repeatedly.

Summary

Not everyone is sensitive to MSG. For those who experience symptoms after consuming it, choosing MSG-free seasonings from the outset may be more practical than trying to avoid only certain dishes or restaurants. Making a habit of reading ingredient labels is therefore an important skill for anyone serious about managing their health.