protein shakes and BF

maiastar

Can anyone tell me if this is okay to drink? I BF but before I was pregnant I would always drink a protein shake for breakfast. Soy milk, a scoop of protein, and some frozen fruit.  I would like to start doing this again and lose this baby weight. I just don't know the ingredients in the protein powder and if they are safe to consume while BFeeding....any recommendations or suggestions are greatly appreciated. TIA