Spirulina is a type of blue-green algae, of which there are several species. It grows best in warm climates and areas with warm, alkaline water. Spirulina is a rich source of nutrients, especially protein. Because of its high nutrient content, and because the cellular walls of spirulina are made up of complex proteins and sugars instead of cellulose, it is easily digested by the body and is considered a vital food source for vegetarians.
Many weightlifters also use spirulina as a protein source.
Spirulina is currently being studied to determine its effects on a number of clinical conditions. Animal studies have determined that another component of spirulina, C-phycocyanin, can reduce inflammation in the colon. Other clinical trials suggest that spirulina can inhibit the growth of some forms of cancers and can reduce the risk of oral cancer in people who chew tobacco. However, patients should always consult with a health care provider before taking spirulina supplements. Spirulina is an algae.