Single cell protein is a term coined in the 1960s to describe microbial biomass produced through fermentation and used as a protein source, especially for livestock. Advancements in biotechnology have helped develop SCP using various microorganisms like yeast, bacteria, and algae. Sources of SCP include bacteria like Cellulomas and Alcaligenes as well as yeasts, actinomycetes, fungi and algae like Spirulina. SCP is composed of proteins, fats, carbohydrates, ash, water and minerals. It contains 50-55% protein from yeast and fungi with a good balance of amino acids but less methionine and cysteine. SCP also has high levels of