Advantages:
As a rule, powdered protein mixes are one of the least expensive ways to get protein. PPMs are "king" when it comes to variety. These supplements are offered as single-source proteins or multi-source blends of whey, milk, casein, egg white, soy, and sometimes, other ingredients (amino acids, creatine, carbs, vitamins and minerals). They're also available in a large assortment of flavors and consistencies ranging from water thin to pudding thick. Because powdered protein mixes are dehydrated, they do not require refrigeration, preservatives, or acid to protect freshness prior to mixing. In fact, most PPMs are good for over 2 years at room temperature. High-quality powdered protein mixes are generally free  of fillers and don't require  binders or stabilizers like bars or RTD protein shakes , so they're usually higher in protein and much lower in carbs than other protein delivery methods. Many PPM products are "instantized" to hydrate almost instantly in liquid, so preparation requires little more than a glass, some water, and a spoon.


Disadvantages:
Though considerably more convenient and better tasting than in years past, PPMs certainly require more "work" than bars or RTDs. In addition to measuring and mixing, there's some cleanup that needs to be done. These factors alone are enough to make a lot of people spend a few extra bucks on the ready-to-go stuff. Here are some other disadvantages: even when mixed in a shaker or blender, instantized powders still have some - albeit small - clumps. Many people claim that pre-hydrated (Protein RTDs) or homogenized (RTD protein shakes) protein beverages have smoother, more consistent flavor and sweetness profiles.
Best Time to Use:
Depending upon the type that you buy, PPMs can be used just about anytime. Take them at times when you're not using RTDs, pre-mixed protein shakes, or RTE bars and bites. By alternating powders with these other protein vehicles, you can save money and provide your liver and muscles with a more diverse amino acid "pool" from which to rebuild and repair exercise-induced micro-trauma. As a rule of thumb, whey and hydrolyzed proteins are generally digested and absorbed very quickly, so they're excellent right after a workout or when trying to gain weight. Egg and soy proteins are utilized at a moderate rate. Milk and casein proteins are absorbed slowest of all, so they make outstanding nighttime proteins or meal replacements. Too much to keep track of? Look for an Augmented Protein System (APS) like Pro Complex APS. This APS includes a blend of many of the finest proteins (six distinct sources from whey and egg) plus added BCAAs, glutamine, digestive enzymes, vitamins, and essential amino acids. With 55 grams of protein, a daily serving or two of a multi-stage protein product like this can eliminate the need for consuming many other proteins throughout the day.