Figure 3: Metabolism of ellagic acid. Ellagitannins are derived from natural sources like fruits, nuts and vegetables. Ellagitannins are hydrolyzable polyphenols which are converted into ellagic acid in vivo under physiological conditions. Ellagic acid is further acted upon by intestinal microbiota, and consequently converted into Urolithin D, Urolithin C, Urolithin A, Urolithin B progressively. Physicochemical parameters of ellagic acid computed by chemistry development kit (CDK) are represented in the Table.