Whey protein isolate, unflavored

~90% protein with the lactose and milk fat filtered out; neutral and low-carb.

Isolate is defined as ≥90% protein with lactose and fat largely filtered out (lactose ~0.5–1%), which suits both a milk aversion and a low-carb goal. Protein quality is essentially identical to cheaper concentrate — near-equivalent amino-acid digestibility — so the premium buys neutrality and low lactose, not better protein.