Green-shelled earth eggs, also called black-bone eggs, are produced by Kuroha black-bone chicken, which is known as "China Black Treasure". Green-shelled earth eggs are very small, each weighing 46 grams on average. The eggshell is light green, the yolk is big and orange, the egg white is thick, and the protein is thick and tender, which is easy to be digested and absorbed by the human body.

The main nutritional components in green-shell chicken eggs are 3-6 times higher than those in ordinary eggs, while the cholesterol content is 20% lower and the protein content is high 12.7%. At the same time, they are also rich in lecithin, cephalin, neuropeptide, high-density lipoprotein, vitamins A, B, C, E and trace elements, among which the content of vitamin E is 2-3 times higher than that of ordinary eggs, which is rich in human body.

Green-shelled earth eggs are rich in cephalin, lecithin, vitamins, minerals, protein and amino acids, which are naturally and easily absorbed. Eating by children and adolescents can promote growth, enhance memory, improve IQ and enhance immune function, and obviously improve symptoms such as anorexia, pica, low immunity and growth retardation caused by zinc and calcium deficiency.