Green foods include water-based ingredients such as spirulina, chlorella and blue green algae as well as cereal grains like wheatgrass and barley grass. They are rich in amino acids, protein, fiber, vitamin B12 and beta-carotene, and may also contain essential fatty acids. Spirulina, for example, provides GLA, DHA and other EFAs.

Research on these nutrient-dense ingredients suggest they can strengthen immune response and increase energy. In addition, some green foods have applications for lowering cholesterol and blood pressure.

Most common in powdered supplement form, green foods can be found in functional food bars and even in cosmetics and personal care products. In facial creams, spirulina is used to revitalize skin and improve moisture retention and collagen elasticity.