A by-product of the manufacture of cheese or casein, it has many commercial uses.
Sweet whey is manufactured during the making of rennet types of hard cheese like cheddar or Swiss.
Acid whey (also known as "sour whey") is obtained during the making of acid types of cheese such as cottage cheese.
If you are looking to avoid dairy, be careful when choosing products like rice or vegetable cheese. Look for casein on the label, many do contain it and yes, that means there is dairy in that non dairy cheese!
My best,
Renay
xo