What exactly is the difference between Star-K and Star-D?
The Star-K symbol on dairy products is cholov yisroel. These products are certified by Star-K Certification, Inc. whose Rabbinic Administrator is Rabbi Moshe Heinemann. Star-D is the registered trademark of the National Council of Young Israel. All Star-D establishments and products are administered by Star-K personnel. All standards of Star-K are employed in Star-D certifications except for the fact that Star-D products are cholov stam – not cholov yisroel.