Quick Navigation

Dimocarpus longan

Dimocarpus Longan (Dragon Eye or Euphoria) is a fruit with limited medicinal use. It does not appear to have a unique composition, but extracts appear quite neuroprotective and may boost cognition.

Our evidence-based analysis on dimocarpus longan features 33 unique references to scientific papers.

Research analysis led by .
Reviewed by
Examine.com Team
Last Updated:
NOTE: We are updating our coronavirus (COVID-19) page with evidence as it comes in.

Summary of Dimocarpus longan

Primary information, health benefits, side effects, usage, and other important details

Longan fruits (Dragon Eye and Euphoria Longan have both been used to refer to Longan fruits) have some traditional usage for alleviating cognitive losses and improving memory. Limited evidence so far suggests this may be true, as oral administration of the fruits to rats appears to exhibit potent neuroprotective effects and has twice been implicated in enhancing cognition.

However, the composition of Longan fruits currently is not remarkable. It is a great source of ellagic and gallic acids, which are potent anti-oxidants; these compounds are not inherently linked to improvements in cognition nor are the Procyanidins or catechins found in Longan. There actually does not appear to be a large amount of compounds known to be unique to Longan fruits, which may be discovered in the future. No bioactive is linked to the cognitive protective or memory enhancing properties.

Beyond that, the polysaccharides appear to be able to interact with the immune system and can act in an immunostimulatory manner. At least one study suggests that the potency is comparable to Ganoderic Acid (from Reishi) but this needs to be replicated; it is another promising avenue.

Other interactions of Longan such as interactions with fat mass, skin quality, or the colorectal cancer interactions are currently unremarkable. There is not enough evidence to suggest Longan fruit as a recommended option for anything although it might be a useful functional food to ingest for cognitive purposes.

Want to know which supplements you should take?

Examine.com bases all of its recommendations based on research. We’re a trusted resource because we don’t sell or even advertise supplements.

If you’re tired of wasting time and money on supplements that don’t work, our 17 Supplement Guides will help you figure out precisely what to take — and what to skip — based on your health goals and the latest scientific evidence. There’s a reason why over 50,000 customers rely on Examine.com’s independent and science-based analysis.

And best of all — free lifetime updates are included!


I want unbiased recommendations to improve my health »

Things to Note

Also Known As

Euphoria Longan, Dragon Eye, Soapberry

  • Allergies to Longan have been reported[1]

Tired of misinformation? Get unbiased info on supplements.

At Examine.com, our incentives line up with yours — getting unbiased information. It’s why we don’t sell any advertising or supplements.

Join over 250,000 people who’ve learned about effective versus overrated supplements, supplement buying tips, and how to combine supplements for safety and efficacy.

Click here to see all 33 references.