The sulfur in the oral chelators can feed the yeast. Those on the Cutler protocol have to deal with that too.
Beware that DMPS does not cross the blood brain barrier to any significant extent and inorganic mercury comes out of the brain extremely slowly (half life maybe 20 yrs).
When people use IV chelation, the chelators, which are not perfect at grabbing Hg, will kick up some Hg that will end up in more sensitive organs such as the brain.
We hear in the Cutler groups that 6 months after using IV folks often end up with greater psychiatric symptoms--anxiety, depression, fuzzy thinking and brain related issues such as reduced control of thyroid and adrenals by pituitary (TSH ACTH issues).