Cr8 gave you the website: http://www.ultralifeinc.com
for the Ultraphos that is used in the Coke flush. This is a food product from a company that sells supplements (not the industrial stuff). If you are in doubt about the safety of this product, then read the many months of back posts of some of us who have used it safely for a long time. AND we have posted the results many times. Being able to so this liver flush has saved lives of those with a bad liver problem. I haven't had any bad reactions to it in 81 liver flushes, and have used a lot of bottles of it. If it were not safe, I don't think Doc could or would have used it on himself, or included it in the instructions with his program for the liver flush. It relaxes the sphincter muscle of the common bile duct so the stuff passes easily thru it and out into the duodenum.
If you're not in a "terminal" situation, then you might choose to use the Clark liver flush, or some other kind of liver flush. You might be one of those people who still has choices and can do a liver flush every 2 weeks and can tolerate the ES. I for one, have been very grateful that I got introduced to the Coke flush. There are other opinions and liver flushes out there. I suggest doing more research if you are still in doubt.
Hope this helps you.