HI yeah it could be a detox reaction, or as JoeUK says, it could also be gut problems. When you have leaky gut etc, you can react to things like supplements poorly. When the gut is further healed, you may find you can absorb them properly without such reactions. Though I think it's safer to keep things basic to be honest.

Diet alone can be a good start to healing the gut or improving it anyway. But if the culprit to all this is mercury or something else, obviously it's got to be dealt to before someone will a more permanent cure. THat's why I think it's wise to treat candida at the sametime as dealing with the underlining cause of it (mercury or other).