I have been harmed by high sulfur type supplements, such as garlic, etc. Yet for some reason i can handle a certain amount in foods, like eggs, onions etc. I just have to watch that I don't go for overkill.

Sulfur can indeed mobilise mercury. Some benefit from sulfur, if they are low in sulfur, but there is a line to how much you can handle and how much more of it is simply going to cause side effects from possibly mobilising mercury.