Yeasts - Members of Saccharomyces, Candida and Torulopsis have been widely studied for SCP production and those of the first two genera are used for some commercial processes using various substrates. The SCP has 55-60% crude, protein which has good amino acid balance except for a deficiency in S-containing amino acids. It is usually very rich in B-group of vitamins.

The SCP is used both for human food and animal feed supplementation. The risk of bacterial contamination is low and recovery by continuous centrifugation is easy.