Unfortunately, last night I tried a sample packet of Sun Warrior Vanilla blend protein powder for the first time in a smoothie and had immediate nausea from it. So bad I had to go lay down for a few hours. Still feeling it this morning. I have not had this trouble with other protein powders. Very strange. To be fair, the spinach I added (that was organic) did seem a little stiff for spinach and "off" so it could have been from that.