PROBLEM TO BE SOLVED: To provide a drink and food, a skin external preparation and a pharmaceutical having high safety by extracting from an industrial waste which is a yeast fungus body obtained after extraction of a yeast essence, using a glucosylceramide from an inexpensive yeast, and having an excellent fibroblast cell proliferation promotion effect compared with a conventional glucosylceramide from a plant raw material.SOLUTION: The fibroblast cell proliferation promotion effect of a glucosylceramide from a yeast, particularly from torula yeast has been checked and found to be an excellent fibroblast cell proliferation promotion effect compared with the glucosylceramide from rice, maize and konjak as a plant raw material.
