The present invention relates to a new method of producing a high-protein, acidified, liquid, dairy product. The invention furthermore relates to new high-protein acidified, liquid dairy product, to protein/mineral compositions and uses of these for producing liquid dairy products having a high-protein content and a low viscosity.

The invention concerns whey-based nutritional compositions fortified with calcium that are suitable for infant nutrition, including infant formula (IF) and growing up milk (GUM). The nutritional compositions are based on -lactalbumin enriched whey protein concentrate that has been fortified with calcium.

The invention concerns whey-based nutritional compositions fortified with calcium that are suitable for infant nutrition, including infant formula (IF) and growing up milk (GUM). The nutritional compositions are based on -lactalbumin enriched whey protein concentrate that has been fortified with calcium.