On the Friendship site they confirm that none of their products contain any animal derived ingredients and that they're products are even Vegan friendly.
Their FAQ section states:
So their sour cream, buttermilk, yogurt, farmer cheeses, and all their cottage cheeses are perfectly fine to eat alhamdulillah.
Are Friendship products considered Vegetarian? All Friendship products conform to vegetarian Diet standards. No animal-based cultures or enzymes are used in Friendship products.