Both are unapproved, unproven, and possibly unsafe.
Consumer reports has been testing lots of supplements and up to 70% of the ones they tested di not contain the amounts of ingredients on the label, or contained none, or contained unlisted ingredients like heavy metals.
Get the energy and protein you need from a diet of whole fresh foods and you will not risk organ damage.
http://www.consumerreports.org/cro/magazine-archive/2010/july/food/protein-drinks/overview/index.htm