This is an opinion. Coke has phosphoric acid in it. It's something like what is in the Ultraphos. It seems to work synergistically with the rest of the liver flush drink. Coke has been an old remedy for an upset stomach for many years.. The EVOO is a lttle nauseating sometimes. There are some who can do the coke flush with less than the 1/2 cup of olive oil, but I couldn't seem to get away with it. You can always use a piece of peppermint candy for the nausea the EVOO causes, too. I know there is one person whom I have doing this program who is substituting grapefruit juice for the coke. I haven't heard how it is working. Whatever works for YOU, maybe.

Phosphoric acid like Pioneer said. Softens the stones. It's like ultraphos+apple juice.

The second reason is to make it easier to drink. It sounds like a stupid reason to add it, but if people either can't drink the OO or if people dislike the liver flush so much they don't do that, it makes the procedure useless right? Personally, I had trouble downing the OO after flush 7, my body would just reject it immediately. A little coke and voila, I'm at flush #17 with no problems.

To me, it's only 2 ounces of coke (non-diet), it's a very small amount (it's not even half of these tiny little baby bottles I have) and it's not like I'm drinking it every day.

It's your choice, if you can drink the OO without, go for it. The original Clark flush works fine.