Regression during chelation - bacteria

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Hi All,

We are in the middle of our 3rd round of chelation. We are using oral

DMSA 25 mg every 4 hours. My son weighs about 43 lbs. During the 1st

round and this round, he has regressed during the on days. Since we

are doing the low and frequent dosing, would the most likely culprut

of the regression be gut bugs? I think we are doing ok with yeast,

but I think bacteria could be getting the best of us. He takes

culturelle twice a day, a probiotic (50 billion), nystatin and today,

we added in biocidin. Or, could the regression be metals moving? We

did a urine metal test after his first round, and his mercury and lead

were in the elevated area (they were 13 and the reference range was

<5 ) Basically, his regression is sleep wakings, very emotional for

no reason, fidgety, stimmy and increase in fears. Any ideas or

suggestions are appreciated! THANKS!