Whey is the watery byproduct of cheese manufacturing which
contains protein, lactose and other solids. As whey is further
processed to achieve higher protein levels (i.e., whey protein
concentrate and whey protein isolate). whey permeate is the
byproduct. Whey permeate, also known as deproteinized whey or dairy
product solids, is composed largely of lactose (approximately 80%),
a natural sugar found in bovine milk.