Chlorella, also called green alga, is a unicellular algae plant. It belongs to chlorophyta. The cell can be round or oval, with small cell and thin cell wall. Inside, the cell contains one cup-mode chromatophore, which will split after the maturation. It has no pyrenoid. During the asexual reproduction, protoplasm can form into 2, 4, 8, and 16 autospore. Then, the spore will emerge into new plant after the burst of the cell wall.

Besides the rich protein, vitamin, microelement and various multi-amino acids, C.G.F can be the only bioactivator arousing worldwide appreciation among the biochemists and nutritionists.

Many researches show that, C.G.F can stimulate the immunoreaction to medicines. It can promote the formation of phagocyte, and improve the vitality of lymphocyte and hemameba. It also has the antineoplastic function. Possibly being a longevity factor, C.G.F can improve the life length of 30%.