I think many who chelate with ALA+DMSA may be deficient in sulphur or vitamin D, which might prevent chelation from working properly. DMSA needs to be taken on an empty stomach, otherwise
absorption can be greatly reduced.

IV DMPS is quite risky, however it has cured some people. Have you seen posts about people cured by oral DMPS? I haven't seen many posts about people using oral DMPS. Apparantly DMPS is not so well absorbed when taken orally.

I have not seen reports of people trying variations of the Cutler protocol such as DMSA+ALA+ NAC, or MSM, or cilantro and getting results with that combination. There aren't many posts by those using at least 100 mg of DMSA with at least 100 mg ALA for at least 100 rounds.