HFCS, is High Fructose Corn Syrup...the sweetener found in most soda pop, and many other things that you buy, that are artificially sweetened. It is a "cheap" way to sweeten things, and make substantial profits for many large companies. It is not good for you. Plain old sugar is much better. If it's chemical, it's not good. I always say, "The closer to nature, the better".

As far as the DMSA, I can't answer that question, except that I understand your frustrations in wanting to take it right now, but it's probably best to wait, until you're done breastfeeding. Anything that detoxes or provokes a poison out of your system, would come out through your breastmilk, as well. I breastfed all my kids, but was not detoxing at the time. I did not know anything about mercury, until the time I gave birth to my youngest (it was right about the same time I realized that was what I had wrong with me). I breastfed her, but knew there was something a bit different that time around (I was more mercury toxic than ever), because her bowel movements were bright yellow and staining all her clothing. It was very odd. Once I weaned her at 10 months, and she was taking formula and a bottle full-time, her bowel movements were normal.

I would think you would either have to stop breastfeeding now to take it, or wait until you're done. Even though you would have mercury already going through your breastmilk, it wouldn't be as bad as "provoked" mercury and DMSA.