Supplements can be in the form of ready-to-drink shakes, bars, bites, oats, and gels and powders, and come in a variety of flavors. What follows is a review of the scientific literature on the good, the bad ,and the ugly regarding protein supplements.
Supplements can be in the form of ready-to-drink shakes, bars, bites, oats, and gels and powders, and come in a variety of flavors. What follows is a review of the scientific literature on the good, the bad ,and the ugly regarding protein supplements.  1. Protein Concentrate vs. Isolate: Protein is derived from various food sources and is concentrated by removing the non-protein parts. The result: a powder that’s 70 to 85 percent pure protein (with the remaining 15 to 30 percent consisting mostly of carbohydrates and fat). Protein 101—The Need-to-Know. Protein is a macronutrient found in many foods such as meats, dairy products, nuts, and beans, to name a few. It’s comprised of amino acids, the building blocks of lean body tissue that promote healthy skin, hair, bones, fingernails, as well as (drum roll, please) muscles. Not only are dairy foods like milk, cheese, and yogurt excellent sources of protein, but they also contain valuable calcium, and many are fortified with vitamin D. Choose skim or low-fat dairy to keep bones and teeth strong and help prevent osteoporosis.  Photo Credit whitetag/iStock/Getty Images. Whey protein, a form of protein that is manufactured from milk, is an excellent source of protein for people of all ages. Consumer whey-protein products are manufactured in the form of whey protein concentrate, whey protein isolate and hydrolyzed whey protein. When whey protein is manufactured, the first step is to change milk into curds and whey. Once that happens, the whey is separated from the curds, after which it is processed into whey protein concentrate, whey protein isolate or Whey protein is the collection of globular proteins isolated from whey. The protein in cow's milk is 20% whey protein and 80% casein protein, whereas the protein in human milk is 60% whey and 40% casein. The protein fraction in whey constitutes approximately 10% of the total dry solids in whey. 1 Native whey protein, the purest form of whey protein which has been extracted from skim milk and not a by product of cheese production, produced as a concentrate and isolate. Whey protein, a form of protein that is manufactured from milk, is an excellent source of protein for people of all ages. When whey protein is manufactured, the first step is to change milk into curds and whey. Once that happens, the whey is separated from the curds, after which it is processed into whey protein concentrate, whey protein isolate or hydrolyzed whey protein. The use of whey protein as a source of amino acids and its effect on reducing the risks of diseases such as heart disease, cancer and diabetes has been the focus of ongoing research as of 2007. Whey is an abundant source of branched-chain amino acids (BCAAs), which are used to stimulate protein synthesis. 1 Native whey protein, the purest form of whey protein which has been extracted from skim milk and not a by product of cheese production, produced as a concentrate and isolate. Whey protein is a mixture of globular proteins isolated from whey, the liquid material created as a by-product of cheese production. Whey protein is commonly marketed and ingested as a dietary supplement, and various health claims have been attributed to it in the alternative medicine community. 1 Native whey protein, the purest form of whey protein which has been extracted from skim milk and not a by product of cheese production, produced as a concentrate and isolate. Source of Whey Protein. Twenty percent of the protein in milk is in the form of whey protein, while the remaining 80 percent is from casein. When whey protein is manufactured, the first step is to change milk into curds and whey. Once that happens, the whey is separated from the curds, after which it is processed into whey protein concentrate, whey protein isolate or hydrolyzed whey protein. Background. Whey is a type of protein found in milk that contains all the essential amino acids (EAA) are needed for muscle growth and repair. Dairy products such as milk and some cheeses are the best “whole food” sources of whey protein. Whole foods, not dietary supplements, should be your first choice for protein. Protein supports muscle growth and repair. People often turn to protein supplements (such as whey, casein, and soy) to optimize those effects, especially after a workout.
http://healthandwellness.kaplan.edu/articles/nutrition/Protein%20Supplements.html http://greatist.com/fitness/protein-supplement-nutrition-guide http://www.webmd.com/fitness-exercise/guide/good-protein-sources http://www.livestrong.com/article/206284-where-does-whey-protein-come-from/ https://en.wikipedia.org/wiki/Whey_protein http://www.livestrong.com/article/206284-where-does-whey-protein-come-from/ https://en.wikipedia.org/wiki/Whey_protein https://en.wikipedia.org/wiki/Whey_protein http://www.livestrong.com/article/206284-where-does-whey-protein-come-from/ http://hprc-online.org/dietary-supplements/hprc-articles/is-whey-protein-helpful-to-optimize-performance
scholarly sources for where protein supplements come from