A recent Consumer Reports study found toxic levels of arsenic, cadmium, lead, and mercury in 3 servings of some of the more popular protein powders out there. The worst offenders are:
-EAS Myoplex Original Rich Dark Chocolate Shake (liquid)
-Muscle Milk chocolate and vanilla (both have almost three times the allowed amount of lead in 3 servings!)
Just another reminder to think before you buy.
Here's a synopsis of the report: http://www.consumerreports.org/cro/magazine-archive/2010/july/food/protein-drinks/whats-in-your-protein-drink/index.htm