The invention relates to sour whey powders enriched in calcium containing bioavailable calcium partly originating from milk, and partly processed together with milk components that maintain and improve some properties of the foodstuffs, and to their production and utilization for enrichment of foodstuffs, and to foodstuffs enriched with them. The 5-12 mass% calcium content of sour whey powder according to the invention is of milk origin and 88-95 mass% is of added organic calcium salt origin.
