The first colon cleanse I ever did was from Dr. Natura. I'm not exactly sure how mercury safe it is, but it was very effective. The tea was pretty wicked because it had senna in it. You aren't supposed to use that long term and some people say not to use it all. I guess I'd have to do more research on it to make a definitive stance.

I remember how terrible I felt the first week. I thought my insides were gonna explode. At the time I was working at Kohl's and it was during Christmas! hahah There was this horrible knot that wouldn't go away. Well I stuck with it and really helped my body clear itself out. I stayed on it for a month and a half. Then about a year later I did it again and did not have symptoms even half as bad as the first. From my experience the first good colon cleanse is really painful. You figure all those years of parasites growing and food clogging the intestines significantly affects the body.

I'd wait to start something new, when you have a few days off in a row from work. Working and detoxing may not mix very well. Especially the first week of it! haha