I have been using K Cups (small "cups" or "pods" made for a Keurig beverage machine) for a while now and I just realized that some of them contain milk powder. Is it okay to drink? Is it kosher at all?
OU have a page dealing with Keurig Green Mountain products relating to the kashrus of K-cups and other prodcuts. There are dairy products. You can check any individual Keurig product there.
The certificates state that the relevant OU symbol is required.
Related to this, the news item from “Kosher Today” says
According to Rabbi Moshe Elefant, COO of the Orthodox Union (OU) Kashrus Division, certified kosher K-Cups used in the machines no longer have the OU symbol on the individual cups although they remain on the boxes that they come in. Thus, a kosher consumer who randomly finds a K-Cup without a box may inadvertently be using a non-certified K-Cup … etc