"It chelates mainly through urine correct? I thought through the colon was safer and alot easier on your kidneys? "

Getting rid of mercury through the colon is much more difficult though, as it is through the bile, and the body likes to recycle the bile, which might be why many often get such bad side effects due to redistribution when they use ALA without DMSA. I guess taking plenty of soluble fiber while using ALA will help trap more of the bile so it is excreted and not reabsorbed and recycled.

There is a danger that DMSA might damage the kidneys if the dosage is much too high.