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whodathunkit - Glad you've had good results. You talk of other metals, which ones? ALA is good not only for mercury: it also removes arsenic and cadmium quite well, and may even chelate lead and more besides. It is also the only thing that crosses the blood brain barrier and enters cells. So, as a rule of thumb, you only ever need ALA. But I like the way DMSA smooths out my rounds on ALA, and I also have a lead problem. Others use DMPS with ALA. There has been some discussion of using EDTA, but people following Andy Cutler's protocol rarely use it. He has said:
"EDTA is an old chelating agent for lead that has been superseded by DMSA, and is an "alternative medicine" treatment for vascular disease - most widely known as the alternative to bypass surgery that has all the heart surgeons up in arms since it actually works but bypass seldom does. As you would imagine, the level of controversy is intense.
EDTA is not an effective chelating agent for mercury detox."
So, it is largely unnecessary. He has alluded to the problem recently of using EDTA:
"There are never any circumstances EDTA should be the first line of therapy for someone with an existing mercury problem. I have NEVER heard a good story involving this, and have heard lots of
bad ones.
The use of EDTA in people with too much mercury around who are sensitive to it causes an impairment of both intellect and emotional regulation. This is the kind of problem that the person who has it is often unaware of and thinks is everyone ELSE's problem. In the extreme it is bipolar disorder or psychosis - you really don't want to
head that direction without a real need and no alternative."
There are many research papers (about 31) showing negative effects from EDTA and Hg complexes. If you're a member of the Yahoo Frequent Dose Chelation Group, it's in the "Links" section. One such study:
"Copyright © 2000 HealthGate® Data Corp. All rights reserved.
Record 1 from database: MEDLINE
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Title
HgEDTA complex inhibits GTP interactions with the E-site of brain
beta-tubulin.
Author
Duhr EF; Pendergrass JC; Slevin JT; Haley BE
Address
Division of Medicinal Chemistry and Pharmaceutics, College of Pharmacy,
University of Kentucky Medical Center, Lexington.
Source
Toxicol Appl Pharmacol, 1993 Oct, 122:2, 273-80
Abstract
We have found that EDTA and EGTA complexes of Hg2+, which conventional
wisdom has assumed are biologically inert, are potentially injurious to
the neuronal cytoskeleton. Tubulin, a major protein component of the
neuronal cytoskeleton, is the target of multiple toxicants, including
many heavy metal ions. Among the mercurials, inorganic mercuric ion
(Hg2+) is one of the most potent inhibitors of microtubule polymerization
both in vivo and in vitro. In contrast to other heavy metals, the
capacity of Hg2+ to inhibit microtubule polymerization or disrupt formed
microtubules cannot be prevented by the addition of EDTA and EGTA, both
of which bind Hg2+ with very high affinity. To the contrary, the addition
of these two chelating agents potentiates Hg2+ inhibition of tubulin
polymerization. Results herein show that HgEDTA and HgEGTA inhibit
tubulin polymerization by disrupting the interaction of GTP with the
E-site of brain beta-tubulin, an obligatory step in the polymerization of
tubulin. Both HgEDTA and HgEGTA, but not free Hg2+, prevented binding of
[32P]8N3GTP, a photoaffinity nucleotide analog of GTP, to the E-site and
displaced bound [32P]8N3GTP at low micromolar concentrations. This
complete inhibition of photoinsertion into the E-site occurred in a
concentration- and time-dependent fashion and was specific for Hg2+
complexes of EDTA and EGTA, among the chelating agents tested. Given the
ubiquity of Hg2+ in the environment and the widespread use of EDTA in
foodstuffs and medicine, these mercury complexes may pose a potentially
serious threat to human health and play a role in diseases of the
neuronal cytoskeleton."
Hope this helps. So (a) it isn't necessary; (b) it is potentially injurious; and, (c) ALA, DMSA and DMPS are tried and tested, and used appropriately pose far fewer dangers.
Best,
Leon