Eel is rich in a variety of nutrients and has a tonic effect. The body contains rare ingredients. Eel also has high nutritional value, as its meat contains rich high-quality proteins and various amino acids needed by humans, as well as vitamin A and vitamin E, which help prevent vision degradation and protect the liver. Eel also contains phospholipids, which are essential nutrients for brain cells. Additionally, eel is known to contain brain-boosting DHA and EPA, with higher content than other seafood and meat.