In July 2010 Consumer Reports found heavy metal contamination in several protein drinks. They tested for arsenic, cadmium, lead, and mercury and found at least 1 in each drink tested:

• Protein Drinks: What’s in them? Consumer Reports

For athletes looking for a protein drink I would recommend using whole foods where possible and only supplementing with a high quality protein powder. My protein drink recipe:

• 8 oz unsweetened nut milk (preferably home made)
• 2 raw eggs from pasture raised chickens
• 2 scoops of Standard Process SP Complete

To this I sometimes add coconut milk or coconut water and those inclined could add a little fruit.