Isolated human multipotent adult stem cell and isolated populations of cells that include human multipotent adult stem cells are disclosed. Human hair-follicle derived multipotent adult stem cells and methods of preparing isolated populations of cells that include human multipotent adult stem cells are disclosed. Isolated human hair-follicle derived multipotent adult stem cell that can differentiate in culture into a neuronal cell, a glial cell, a melanocyte cell, a muscle cell, an osteocyte, a chondrocyte, and a lymphocyte. Isolated human hair-follicle derived multipotent adult stem cell that can grow in cell culture in spheres are disclosed. Human pancreas derived multipotent adult stem cells, human liver derived multipotent adult stem cells, human kidney derived multipotent adult stem cells, human heart derived multipotent adult stem cells, human neural derived multipotent adult stem cells and methods of preparing isolated populations of cells that include such human multipotent adult stem cells are disclosed. Method of treating an individual who has diabetes, cardiac muscle damage, muscle damage and disease, neurodegenerative disease or nerve damage or injury, bone loss, damage and/or disease, cartilage loss, damage and/or disease, hair loss and immune disorders, are disclosed.