Patty,

According to my research (I had all my mercury removed in 2000 and did a lot of research before that), this is what I've found about MSM:

According to my research, the net effect is that it facilitates the passage of mercury through cell walls which, in turn, raises blood mercury levels.

I got quite sick on it and haven't taken it since. For me, I noticed that the mercury symptoms return when I take it, which make sense considering the information above.

Concerning how long it will be before you can take it...

I haven't found anything about that. All I know is that I'm much less reactive to sulphur -containing foods now than before and immediately after the removal.