I too had a terrible experience with oxyclean. I took it for 4 days. On the 3rd day I had terrible fatigue, could hardly keep my eyes open, on day 4 I developed agonising pains in my bowel (lower left side)that doulbed me up. THEN - a period started with the worst cramping pains I had ever experienced, and I had to take 2 days of work. And they sell this product without any cautions or warnings. By the way, they would not refund my money either and completely ignored my complaint emails to their website.