Disclaimer: This article is for educational and scientific popularization purposes only and does not constitute medical advice.

Looking to supplement γ-aminobutyric acid (GABA) safely and naturally? Studies show that it may have positive effects on relieving stress and maintaining a calm mood. This can start with the foods on your table.

Fermented Foods

Fermented foods are one of the richest dietary sources of GABA. During fermentation, microorganisms (such as lactic acid bacteria, Aspergillus, and Bacillus subtilis natto) convert precursors such as glutamic acid in raw materials into GABA through metabolic activities. Common examples include natto, kimchi, yogurt, cheese, soy sauce, and vinegar.

Cereals

When grains germinate, they activate endogenous glutamate decarboxylase (GAD), which catalyzes the decarboxylation of glutamic acid to produce GABA. Germinated brown rice stands out among them, with GABA content several to dozens of times higher than that of regular brown rice. Oats and wheat germ are also excellent sources of GABA.

Tea

Tea is one of the natural sources of GABA. A study analyzing 98 Chinese tea samples using High Performance Liquid Chromatography (HPLC) showed that white tea has significantly higher GABA content than other types of tea^[1].

Vegetables and Fruits

The GABA content in vegetables and fruits is generally lower than that in fermented foods and germinated grains, usually ranging from 0.3 to 32.5 μmol/g^[2]. Examples include spinach, tomatoes, potatoes, pumpkins, grapes, and citrus fruits.

Synergistic Care and Efficient Supplementation

Want GABA to work better? Try starting with these aspects:

Nutritional pairing: Studies have found that vitamin D deficiency leads to imbalance of the brain's excitation/inhibition (E/I) balance, and vitamin D supplementation has been proven to improve functional impairment of the GABA system^[3][4].

Gut health: Beneficial bacteria in the gut (such as Lactobacillus brevis, Bifidobacterium dentium, and Bacteroides) can help synthesize small amounts of GABA and maintain normal signal transmission between the gut and the brain. Keeping the intestinal flora balanced can also indirectly enable GABA to exert its physiological functions^[5].

Of course, for people with clear and efficient supplementation needs, choosing compliant GABA health food products is also a convenient and effective way to supplement. Given the physiological characteristics of GABA, people with hypotension, pregnant and lactating women, and those taking sedatives or anti-anxiety medications are advised to consult a physician before consuming GABA supplements to ensure safety.

In the next issue, we will focus on relevant experiments on GABA and discuss the specific physiological regulatory effects that exogenous GABA may exert in the body after ingestion.