Casein constipation

[fruitfly]

Hi there,
It is a few months I try to use casein from saturee but it gives me very severe constipation. I tried to add it to juices or dissolve it in warm liquids but the results it is always the same. I thought casein was a good way to increase protein intake and keep tryptophan low but it doesn't work for me ( I only tried the casein from saturee). Has anyone else experienced it?
Many thanks!