Protein drinks are liquids that are meant to efficiently increase protein in the human diet. Protein drinks may contain different several types of protein in various proportions. Some of the common protein drink ingredients are eggs, milk and soy. Not all protein are created equal. The source of the protein and the manufacturing process can affect how the human body digests the amino acids. Whey and casein, both derived from milk, are commonly made into protein drinks. Whey is more suitable after intense workouts, and casein is more suitable as a meal replacement.http://www.webmd.com/diet/protein-shakes?page=2

Protein drinks are marketed as drinks that can help people lose weight, build muscles or fight aging. While protein can contribute to these goals, protein drink providers can inflate the beneficial properties of protein. Some protein drinks are sold ready-to-drink, and some protein drinks are sold in powdered form and have to be mixed with water, milk or juice for consumption. Conventionally sold to athletes and bodybuilders, protein drinks are now marketed to pregnant women and teenagers as a quick way to a better-looking physique.http://www.consumerreports.org/cro/magazine-archive/2010/july/food/protein-drinks/overview/index.htm T

According to a Consumer Reports investigation, some protein drinks contain potentially dangerous levels of heavy metals like lead and cadmium. The consumer's magazine held an independent lab test on 15 protein drinks including liquid formulas and powders for any trace of contaminants like lead and mercury. While most products did not show unsafe levels, three products, when consumed at three servings per day, could expose the consumer to unsafe levels of arsenic, cadmium and lead. Some protein drink products surpass the limits suggested by the US Pharmacopeia.http://www.webmd.com/food-recipes/news/20100603/report-protein-drinks-have-unhealthy-metals

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