GABA oolong (佳葉龍茶)

tea imagery: Bear in its winter den

GABA oolong goes through a stage with very little oxygen, which increases the GABA content of the leaves. Taiwanese examples often have notes of fruit, honey and fresh bread. The plant variety and roast give each tea its character.

History

The method for making GABA-enriched tea was developed in Japan and later used for Taiwanese oolong. With little oxygen present, enzymes in the fresh leaves convert some glutamate into GABA. These stages may alternate with exposure to air, before the leaves are fully dried. Producers use different cultivars, oxidation levels and roasts.

The bear in its den suggests a quiet tea break. The illustration’s soft light and warm colours echo the amber brew.

Terroir

Taiwan; Nantou is one production region. Varies by garden. Varies from garden to garden. Depends on region, elevation and season. GABA describes processing, not an origin or cultivar. Ask for the growing region, harvest year and roast level.

Leaf

dry leaf: Often rolled into greenish-brown balls or clumps; shape and colour vary with processing.

aroma in a warmed vessel: The dry leaves in a warm gaiwan may smell of bread, honey or fruit.

aroma after brewing: Notice how water changes the aroma: some teas lean towards baked fruit, others towards flowers.

taste: Often honeyed, fruity or bready, sometimes with a little tartness. The batch and brewing method shape its body and astringency.

finish: Look for lingering sweetness or fruit, and notice whether the tea leaves your mouth feeling dry.

Properties

Traditional descriptions: This is a modern processing method. The fire imagery belongs to the site’s colour palette and illustration.

What to know: Research in humans is limited, and a higher GABA content does not make the tea a proven treatment for anxiety or insomnia. Figures in mg per 100 g refer to dry leaves, not a cup of tea. The amount in a particular product needs to be measured.

Over a cup of tea: Start with a small cup. Notice its flavour and strength, and how you feel, before pouring another.

Caffeine: Contains caffeine, with the amount depending on the leaves and brewing. GABA does not reliably counteract it. If caffeine affects your sleep, this tea is not a suitable sleep remedy.

How to brew

A glazed gaiwan or small 110 ml teapot, with room for the leaves to open. 5 g / 110 ml. Fresh drinking water at 90–95 °C; adjust this starting point to taste. Time for each infusion: 15 s, 15 s, 20 s, 30 s, 45 s, 60 s.

When to drink

Earlier in the day if caffeine affects your sleep. All year round. For a tea break or a tasting alongside another oolong. Try nuts, dried fruit or baked apple; taste the tea on its own first. On your own or with friends to compare tasting notes

What to notice

Sit comfortably and let the tea cool to a pleasant drinking temperature.
Take a small sip and pick out one aroma or flavour.
Set the cup down and notice how the flavour changes after you swallow.

Questions and answers

How do you brew GABA oolong?

What does GABA oolong taste like?

Often honeyed, fruity or bready, sometimes with a little tartness. The batch and brewing method shape its body and astringency.

How much caffeine is in GABA oolong?

Contains caffeine, with the amount depending on the leaves and brewing. GABA does not reliably counteract it. If caffeine affects your sleep, this tea is not a suitable sleep remedy.

What else should I know about GABA oolong?

Research in humans is limited, and a higher GABA content does not make the tea a proven treatment for anxiety or insomnia. Figures in mg per 100 g refer to dry leaves, not a cup of tea. The amount in a particular product needs to be measured.