and they vary greatly. Diet Coke has 46mg/12oz, Diet Pepsi:34, Sam's Club:34, Winco:12. All those are a lot less than a cup of coffee (140mg), but I wonder why the off brands don't include more. I can't imagine that it is expensive (Google says that you can buy 100,000mg online for $10). You would think the off brands would include more and cut into the energy drink market.