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I think magnesium chloride is the best form of magnesium to use as a companion supplement. I this case, it should not be necessary to do salt load/flush.
Chloride competes with bromide at the renal level and increases the renal clearance of bromide[xi] thus magnesium chloride is ideal for magnesium supplementation. Some patients require up to 2 years of
Iodine therapy to bring post loading urine bromide levels below 10 mg/24 hr, if chloride load is not included in the bromine detoxification program. Rapid mobilization of bromine from storage sites with orthoiodosupplementation combined with increased renal clearance of bromide with a chloride load often causes side effects. Increasing fluid intake and adding a complete nutritional program minimizes these side effects.
[xi] Rauws, A.G., Pharmacokinetics of Bromide Ion-An Overview. Fd. Chem. Toxic., 21:379-382, 1983