Yu Chang

Let’s understand what oolong tea really is. After freshly picked tea leaves are harvested, they go through processes such as withering, oxidation, and roasting before becoming the tea we drink. The level of oxidation determines whether the tea becomes oolong, green, or black tea. 

  • Black tea is fully oxidized
  • Green tea is not oxidized
  • Oolong tea falls in between — partially oxidized.

Because of this mid-level oxidation, oolong tea carries the refreshing qualities of green tea along with the sweetness and smoothness of black tea.

Where Is Oolong Tea Produced? What Are the Common Taiwanese Oolong Varieties?

Oolong tea is grown mainly in China, Vietnam, Indonesia, other Southeast Asian countries, and Taiwan. Among these, certified 100% Taiwanese High Mountain Oolong Tea is especially renowned worldwide.

Different tea cultivars and growing regions produce dramatically different flavors. In Taiwan, three of the most common oolong teas are:

Alpine Oolong: Its light oxidation, delivers an exceptionally pure and refreshing flavor. It features a natural floral aroma and gentle milky fragrance. Grown in Taiwan’s iconic regions — Alishan, Lishan, and Dayuling.

Dark Roasted Oolong (Tieguanyin): is a medium-oxidation, heavily roasted tea with bold, rich flavors. Notes of chocolate and malt are balanced by a naturally sweet, sugary finish — perfect for a satisfying, aromatic cup.

Red Oolong: has an oxidation level close to fully oxidized teas, making it a unique tea that sits beautifully between traditional oolong and black tea. Its liquor is bright, vibrant red, yet it retains the smooth, sweet character of oolong. The flavor opens with a deep fruity aroma and finishes with a soft, elegant sweetness. It’s the perfect choice for anyone looking to explore a distinctive oolong with the richness of black tea.

The 6 Key Nutrients in Oolong Tea

Beyond its rich flavor, oolong tea is appreciated for its nutritional profile. Here are the six main nutrients found in oolong tea

  • Tea polyphenols
  • Minerals (potassium, phosphorus, calcium, magnesium)
  • Vitamins (A, B1, B2, E)
  • Phytonutrients (beta-carotene, lutein)
  • Caffeine