By Rabbi Gordimer
Milk is the most basic source of all that is dairy. Milk is also pretty basic from a kashrus perspective; so long as it is not cholov beheimah temei’ah (milk from a non-kosher species) or cholov akum (milk which is unsupervised or of unverified origin), milk is always kosher. Thus, most dairy materials made directly from milk would appear to be simple from a kashrus standpoint.