Light micrograph (darkfield) of a colony of cyanobacteria Aphanizomenon flos-aquae. It is one of the most common species of algae that is commonly used as a dietary supplement as it is a blue-green algae that can be commercially processed. It is known to contain various nutrients such as vitamins, amino acids, proteins, and phytochemicals. Magnification: x140 when printed at 10 centimetres wide at its longest edge.