Does monosodium glutamate (MSG) pose any harm to the human body?

Monosodium glutamate (MSG), whose primary component is the sodium salt of glutamic acid, is also known as flavor enhancer, Ajinomoto®, sodium glutamate, or sodium glutamate derived from wheat gluten. It is a common umami-enhancing food additive. As a daily cooking seasoning, MSG enhances the savory flavor of soups and dishes. However, excessive intake may pose significant health risks. So, does MSG pose any harm to human health? The following section addresses this question.

Does MSG Pose Health Risks?

Generally speaking, moderate consumption of MSG is considered safe and unlikely to cause adverse effects. However, excessive intake may impair skeletal development. This occurs because high levels of MSG can inhibit inhibitory neurotransmitters in the nervous system. Moreover, it suppresses hypothalamic secretion of thyrotropin-releasing hormone (TRH), thereby interfering with normal bone development—especially in children. Animal studies have shown that young mice and chicks are particularly vulnerable to MSG toxicity, which can damage brain and optic nerves. Additionally, individuals with heightened sensitivity may experience dizziness, headache, drowsiness, muscle spasms, or even shock after consuming excessive MSG. Therefore, MSG should be used in moderation to safeguard health.

Additional Information: Health Risks Associated with Excessive MSG Consumption

1. Induces Thirst

MSG contains sodium but lacks a salty taste, making it easy to consume unintentionally in excess. Individuals aged 60 years or older are especially sensitive to sodium intake. Thus, elderly people and those with hypertension, kidney disease, or edema should limit their MSG consumption.

2. Triggers Headaches

The main component of MSG is sodium glutamate, which breaks down into glutamic acid during digestion. In brain tissue, glutamic acid is enzymatically converted into an inhibitory neurotransmitter. Excessive intake may disrupt the natural regulatory balance of the nervous system.

3. Causes Zinc Deficiency

When MSG intake exceeds the body’s metabolic capacity, blood glutamate levels rise. Elevated glutamate interferes with the absorption and utilization of essential minerals—including calcium, magnesium, and copper—and particularly binds with zinc in the bloodstream to form zinc glutamate, a compound that cannot be utilized by the body and is excreted, leading to zinc deficiency.

The above outlines potential health risks associated with MSG consumption. We hope this information is helpful to you.