SOURCES
http://www.consumerreports.org/cro/magazine-archive/2010/july/food/protein-drinks/overview/index.htm
http://jimmysmithtraining.com/six-pack-diet/heavy-metal-in-popular-protein-powders/
http://www.tonygentilcore.com/2010/06/does-your-protein-supplement-have-more-heavy-metal-than-a-metallica-concert/