What Is Whey Protein Isolate?

Q: What Whey Is in the First Place?

Cheese-making starts with milk. The casein curdles into solid cheese; the watery liquid left behind is whey. Liquid whey contains 5-7% protein by weight, plus lactose, minerals, and fat. Dried into a powder, raw whey is about 11-15% protein, which is too dilute for sports nutrition. So manufacturers concentrate it further. Most "100% Whey" products on the market are concentrate. Most products labeled "Isolate," "ISO," "Pure," or "Lean" are isolate. If both terms appear on the same label, it is usually a blend, and the order matters: ingredients are listed by weight. Liquid whey is passed through ceramic membranes at low temperatures. The membrane pores let lactose, fat, and minerals through while holding back the protein molecules. The retained protein concentrate is then spray-dried.

Q: Whey Isolate vs Whey Concentrate: Which Should You Buy?

The honest answer to whey isolate vs concentrate. Protein content, lactose, price per gram and Value Scores compared head-to-head across 12

Question

What Is Whey Protein Isolate?

ProteinPrice Editorial · Accepted Answer

Whey protein isolate is whey that has been filtered to contain at least 90% protein by weight, with under 1% lactose and minimal fat or carbs. The two main filtration methods are microfiltration (CFM, gentlest) and ion exchange (cheapest, slightly denatures protein). Isolate costs more than concentrate (typically 30-60% premium per gram of protein) but is the right choice for people with lactose sensitivity, those cutting fat aggressively, or anyone who wants the fastest-digesting protein available.

What Is Whey Protein Isolate? (vs Concentrate): ProteinPrice.com