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Coffee beans harvested from the feces of the Asian palm civet (Paradoxurus hermaphroditus) may have higher levels of fats and other key flavor-enhancing compounds than traditionally harvested beans. The results, published in Scientific Reports, may help explain why this type of coffee is so prized.

Civet coffee, also known as kopi luwak, is one of the most expensive types of coffee in the world, and can sell for more than US $1,000 per kilogram of beans.

The beans are harvested from the fecal matter of civets—usually Asian palm civets—which eat ripe coffee berries and digest the pulp while the beans inside pass through the digestive system. Although this type of coffee has been harvested and sold for over 100 years, there is still debate around whether the unusual harvesting method changes the coffee's chemical composition.

Palatty Allesh Sinu and colleagues collected 68 fecal matter samples from wild civets on five estates growing "Robusta" coffee in Karnataka, India, in January 2025. They also collected ripe coffee berries from each estate for comparison.

Samples of all bean groups were ground for chemical analysis after cleaning. The analysis shows that the civet beans had a significantly higher total fat content than the manually harvested beans. The civet beans also had significantly higher levels of two fatty acid methyl esters (FAMEs)—caprylic acid methyl ester, and capric acid methyl ester.

The authors suggest that the chemical differences in the civet coffee are a result of fermentation of the beans in the digestive system of the civets, and that the differences likely affect the coffee's final flavor.

They suggest that the higher fat content would affect the coffee's aroma and taste profile, while the higher levels in the two FAMEs may add a dairy-like flavor. However, the authors caution that they analyzed unroasted beans, and that the roasting process will further affect the beans' chemical composition.

They also note that they analyzed Robusta beans, while most civet coffee is produced using Arabica beans.