As a possible alternative, a standardized rose-hip powder* made from the seeds and husks of fruit from a subtype of Rosa canina is available. This powder inhibits leukocyte functions that cause cell injury in osteoarthritis. The plants are grown according to good agricultural practice in standardized fields in Denmark and Sweden. When the fruits are mature, they are harvested and frozen immediately. Selection of optimal fruits for later production of powder is made by a laser technique, and the computerized drying process does not exceed 40 C. The vitamin and mineral content of the powder is controlled.