Instant Whey Pro is Reflex's flagship high-in-protein and low-in-fats powder, and has been for nearly two decades. If you're looking for a protein that's high quality but low in calories, this ones for you. Reflex Instant Whey Pro hormone and antibiotic free and made from the milk of grass-fed cows. Milk from grass-fed cows is richer in omega-3 fatty acids and has up to five times as much CLA. Instant Whey Pro also contains LactoSpore, a friendly bacteria, and digestive enzymes.