Stem cells are highly valuable tools in many areas of research and therapeutics due to their self-renewing properties and capacity for differentiation. In vitro culture of stem cells must be a carefully controlled process, and different stem cell types (such as embryonic, mesenchymal, hematopoietic and neural) each require specific media components, such as supplementation, growth factors and other signaling molecules. For convenience and reproducibility, a number of commercial stem cell media are commercially available in ready-to-use formulations. For specific ingredient information and instructions, be sure to visit the supplier pages.