Spirulina is an aquatic micro-organism often referred to as an algae, though it more closely resembles bacteria. It is used as a food supplement to combat malnutrition. 1 gram of spirulina is said to be as nutritious as 100g of spinach or carrots, and is cheaper. It has an extremely high protein content, with 60-70% of its dry weight consisting of a balanced mix of various essential amino acids. Further it is very rich in beta carotene (to produce vitamin A), iron, vitamin B12, ganna-linolenic acid and other micronutrients. It has no cell wall and is therefore very easy to digest.