Pros

  • Tastes like freshly brewed green tea with no added sugar, offering an authentic and pure experience.
  • Smooth and hydrating, making it suitable for drinking any time of day.
  • Very low in calories (only 5 per bottle) and contains no added sugar, making it a healthy choice.
  • Contains purified water, green tea, and Vitamin C, appealing to those looking for a nutritious beverage option, including diabetics.
  • The flavor is complex and distinctly bitter, which fans of sophisticated, less sweet drinks (like black coffee or grapefruit juice) may appreciate.
  • Convenient packaging, often available in bulk cases, which some users find handy.
  • Comparable taste regardless of whether produced in Japan or Taiwan, suggesting consistent quality.
  • Can be enjoyed cold or mixed with sparkling water for variety.
  • Some users find it revitalizing and a perfect refresher after physical exertion.

Cons

  • Many reviewers find the taste extremely unpleasant and ofutting, describing it as bitter, dirt-like, or smelling like seaweed.
  • The flavor is not recommended for traditional tea lovers or baristas, nor suitable for ceremonial use.
  • Not a good choice for those preferring sweeter or sodike beverages due to its bitterness.
  • The product is discontinued, making it harder to find and disappointing to loyal fans.
  • Several users strongly advise against purchasing due to the poor taste quality and overall disappointing experience.
  • Does not provide a refreshing or agreeable experience for a significant portion of consumers, whether served hot or cold.

Bottom Line

If you’re a purist or a fan of genuinely bitter, unsweetened Japanese green tea, Ito En Oi Ocha might be just your cup of tea—especially if you want a low-calorie, no-sugar beverage that’s authentic and hydrating. However, be warned that many find its taste off-putting and even unpleasant, describing it as more “seaweed” or “dirt” than tea. Plus, this product is discontinued, so availability is limited and uncertain. If you’re looking for a smoother, more approachable green tea experience or easier availability, consider keeping an eye out for other Ito En varieties, including their Jasmine Green Tea when it returns, or other well-reviewed unsweetened green teas from trusted Japanese brands.

Lowest at any Popular Retailer
$1.92 at Amazon

Where to Buy

Prices last updated: March 28th 2026 4:40 pm
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