Pro-NOS is the absolute highest quality protein. Let us explain. You know whey is the best protein for muscle growth. You know whey protein isolate is absorbed faster than whey protein concentrate. And now, with Pro-NOS, you get whey protein isolate that is "multi-fractionated" from regular whey isolate, giving you highly refined whey protein fractions that target specific metabolic pathways in the human body. Pro-NOS consists of the ACTINOS fraction that is designed to up-regulate nitric oxide synthase, and the VAT-Burn fraction that has been studied to help burn visceral adipose tissue (VAT), or belly fat. In addition, the Pro-NOS multi-fractionated whey is blended together with the highest quality whey protein concentrate so your body absorbs all 42 grams of whey protein over an extended time. Your muscle growth depends on two factors: 1) how many aminos you can deliver to your muscle cell and, 2) how long you can keep the process of constructing new muscle (protein synthesis) cranking. With Pro-NOS, you do both at the same time! You see the whey fractions you find in Pro-NOS not only provide your body with the best muscle-building amino acids you can find, but they also increase nitric oxide by 950% giving you greater - and more sustained - amino delivery. That's why with Pro-NOS you build more muscle - faster! Now you can boost your nitric oxide levels by 950% - without taking extra arginine! That's with whey and only whey. You see, the ACTINOS- fraction of Pro-NOS increases NOS enzymes that make nitric oxide out of arginine! Now you can get more muscle definition without changing your diet or exercise. How? The VAT-Burn fraction of Pro-NOS specifically targets hard-to-lose belly fat and reduces it by 4.30%! What's more Vat-BURN strips off 5.08% of total body fat. With Pro-NOS, you can also expect great taste. Pro-NOS comes in six mouth-watering flavors: Dutch Chocolate Royale, French Vanilla Creme, Banana Cream, Cookies & Cream, Wild Berry Cream, Mochaccino.