I've been taking Chlorella and Spirulina off and on for the last 7-8 months. Just recently I started noticing that I was getting some stabbing pains in my abdomen after taking my supplements. They grew steadily worse each day until I was utterly sick and in terrible pain one morning and realized that it had to be one of the supplements I was taking. Through the process of elimination (and many races to find the activated charcoal!), I believe I have narrowed the culprit down to Chlorella. Has anyone else had this issue? The last time I took a full dose I was absolutely ruined for the day - diarrhea, exhaustion (that one was weird), and excruciating stabbing pains in my stomach until the activated charcoal kicked in. Does anyone have any thoughts as to why this may have suddenly come on? By the way, I have always used NOW Organic Chlorella, and only 6 tablets a day (the recommended dosage).