Ok - here is some good info i found at vinces ms.
30 grams of protein is probaly the maximum that you can absorb at one time, so don't waste it. You can always have more later. It is more important to keep you protein/nitrogen levels adequate througout the day, rather than in surges. Critics will claim that extra protein will just turn to fat. It's not that simple and it would contradict the thoroughly doccumented fat loss of the high-protein Atkins diet.
After digestion and breakdown of protein, the various free amino acids can be activated for muscle synthesis by their specific enzymes plus one of the energizing phosphate compounds - either ATP [adenosine triphosphate] or AMP [adenosine monophosphate].
If not needed for muscle synthesis, the process of deamination in the liver will remove nitrogen from the amino acid turning it into a keto-acid which makes it available for other body functions. These keto-acids can be either glycogenic [carbohydrate forming] or ketogenic [fat forming]. The majority of amino acids, if not used for muscle or other body protein synthesis, become glycogenic.
So, if your consume 40 grams of a "quick" protein like whey, and your body can only use 30 grams for muscle and other body protein synthesis at that particular time, some of the "extra" grams of protein can be turned into carbs by your body which will then convert to glucose. If you are on a high-protien / low-carb diet, you probably could use some glucose to refill the glycogen stores in your liver and muscles, which means that it probably would not spike your insulin or be stored as body fat.
A big complaint against high-protein diets [Atkins] is that you do not have enough glucose. The same critics claim that the small amount of possible protein derived glucose will make you fat. Which is it? An extra 10 grams of protein, that possibly will be converted through a complex process into glucose, cannot be compared to a bagel that has 51 grams of high-glycemic carbs that convert directly to glucose.
i don't know if a link is appropriate because they are a supp company so i'll defer for now.