To provide a sweetener capable of being added to feeds for the culture of piggies in high nutrition absorbability and at rapid growth rates, capable of being used as an additive for the rapid growth culture of chickens, eels and fishes at extremely low illness rates, capable of being utilized as a food additive for enhancing a hematinic action, increasing immune antibodies, and stimulating appetite due to high sweetness, capable of being used as an additive for the effective utilization of bean curd lees of industrial waste to lower the production cost by 20-30%, and capable of being mixed with Ganoderma lucidum spores to improve the carcinostatic effect.

For example, stevia plant is fermented, dried, pulverized, mixed with spiral water algae or green laver powder, and, if necessary, further mixed with tea powder, San-chi ginseng powder, an enzyme, a perfume, Ganoderma lucidum powder spores, bean curd lees, and the like. The produced powder is added to general feeds as a feed additive or to foods, confectionery, drinks or medicines as a food additive to exhibit high nutritive value effects at low costs.