DMSA, DMPS or ALA: Which Chelator Removes Which Metal?

Why is chelator advice online such a mess?

If you have ever googled chelators and felt like you landed in a biochemical food fight, relax. It is not you.

Detox advice online is a mess because everyone argues doses before they understand which chelator does what.

So here it is in one clean, no-drama breakdown.

The metal-by-chelator matrix

Read that grid before reading anything about dose. A protocol that works beautifully for one metal may do nothing at all for another.

ALA: the only chelator that reaches the brain

ALA is unique because it is both fat- and water-soluble, which lets it cross the blood-brain barrier. That makes it the only chelator capable of reaching the brain and pulling mercury and arsenic out safely, when used on a strict schedule.

Removes: mercury, brain and body. Arsenic. Does not remove: aluminium, lead, cadmium, antimony.

ALA's superpower is also its danger. See Part 4.

DMSA: the bloodstream cleaner

DMSA is water-soluble and stays mostly in the bloodstream, which makes it ideal for clearing metals circulating in blood and soft tissue without touching the brain.

Removes: lead, excellently. Mercury, blood only. Arsenic. Does not remove: brain mercury, aluminium, nickel, cadmium.

Think of DMSA as the first-phase cleanup crew: stabilising, gentle, and a good starter chelator.

DMPS: the heavy hitter

DMPS is DMSA's more aggressive sibling. Similar metal targets, faster action, but stronger reactions in sulfur-sensitive individuals.

Removes: mercury from the body, with strong affinity. Antimony. Arsenic. Does not remove: brain mercury, since it cannot cross the blood-brain barrier. Aluminium. Lead, weakly.

For people who tolerate sulfur well, DMPS offers powerful body mercury removal.

Why can't DMSA and DMPS reach the brain?

Because of charge. Both are negatively charged molecules, and charged molecules do not cross the blood-brain barrier or cell membranes efficiently. That is not a limitation of dose or duration. It is physics, and no protocol design gets around it.

ALA is both water- and fat-soluble, which is precisely why it goes where they cannot.

There is a second structural point worth knowing. X-ray spectroscopy work found that DMSA and DMPS lack sufficient space between their thiol groups for one molecule to form two bonds to a mercury ion. They instead form weaker "sandwich" complexes, two chelator molecules per mercury atom.

That weaker binding is part of why redistribution is a live concern with these agents rather than a theoretical one.

Why does nothing on this list remove aluminium?

Aluminium is a completely different beast. Thiols, meaning sulfur-based chelators like DMSA, DMPS and ALA, do not bind aluminium well at all.

Aluminium responds to a different set of tools entirely:

• Silica water and diatomaceous earth
• Malic acid
• Lactoferrin
• Orthosilicic acid
• Fulvic and humic complexes

Different chemistry, different tools. More on this in aluminium detox.

Why is EDTA overrated for metal detox?

EDTA has excellent marketing and a poor binding profile for the metals people usually want removed. It is a weak binder for mercury and arsenic, mediocre for lead, and terrible for aluminium.

Where EDTA is genuinely useful:

• Calcium-based plaque
• Cardiovascular protocols

It is not a mercury chelator and should not be treated like one.

For completeness: EDTA is an established hospital treatment for acute lead poisoning, administered intravenously under medical supervision. That is a different clinical situation from the chronic low-level burden this series is about.

Not every metal is worth chelating

The table above covers the metals people usually ask about. The fuller picture is that metals fall into roughly three groups.

Responsive. Lead, mercury and thallium bind well and come out, though mercury is the most timing-dependent of the three.

Partial. Arsenic, cadmium and antimony respond, but usually alongside mineral repletion rather than through chelation alone. Cadmium in particular competes with zinc, so restoring zinc does much of the work.

Poor responders. Aluminium, nickel, barium, silver and fluoride are not meaningfully chelated by any of the agents above. For these, reducing exposure and supporting elimination achieves more than any chelator will.

That last group is where people waste the most time and money: running aggressive protocols against metals that were never going to respond to them.

Which chelator should you use, and when?

What this article does not tell you

• This is not a dosing guide. Which chelator suits you is one question; how much and how often is another entirely. That is Part 9.
• These are prescription medications in most jurisdictions. DMSA, DMPS and EDTA are not supplements. Obtaining and using them belongs under medical supervision.
• Combining chelators increases complexity, not just effectiveness. The ALA plus DMSA or DMPS combinations mentioned here require someone who knows what they are doing.
• Sulfur sensitivity is real and common. Anyone reacting badly to sulfur-containing foods should raise that before starting DMSA or DMPS.
• This matrix reflects the mercury detox literature Dawn works from. Conventional toxicology broadly agrees on which metals each agent binds, and disagrees on the appropriateness of chelation for chronic low-level burden. Worth knowing where the line sits.

Go deeper

This article covers which chelator binds which metal. The full picture, including the chelation response table for all seventeen metals, with the recommended approach for each, is in Dawn's forthcoming book on interpreting the OligoScan, written with Jeff Lioon Jr.

Join the launch list at oligoscanbook.com

References and further reading

1. Aposhian HV. DMSA and DMPS: water soluble antidotes for heavy metal poisoning. Annu Rev Pharmacol Toxicol. 1983.

2. George GN, et al. Mercury binding to the chelation therapy agents DMSA and DMPS and the rational design of custom chelators for mercury. Chem Res Toxicol. 2004.

3. Risher JF, Amler SN. On the limited reduction in blood mercury and redistribution to kidney with DMSA and DMPS. Neurotoxicology. 2005.

4. Cutler, Andrew, PhD and Rebecca Rust Lee. The Mercury Detoxification Manual.

5. Hammond, David. Mercury Poisoning: The Undiagnosed Epidemic.

6. Spiller, H.A. et al. Rethinking treatment of mercury poisoning: the roles of selenium, acetylcysteine, and thiol chelators. Toxicology Communications, 2021.

7. Literature on thiol chelator binding affinity and blood-brain barrier permeability.

8. VIGEO Health Medical Disclaimer

Series navigation

← Part 5: Does selenium chelate heavy metals? → Part 7: How do selenium and ALA work together? All ten parts: Chelation Education Series

Questions and Answers

Q: Which chelator removes brain mercury? A: Alpha-lipoic acid is the only one. ALA is both fat- and water-soluble, which allows it to cross the blood-brain barrier. DMSA and DMPS cannot cross, so they clear mercury from blood and body tissue only. ALA also removes arsenic but does not bind aluminium, lead, cadmium, or antimony.

Q: What is the difference between DMSA and DMPS? A: DMSA is water-soluble, stays mostly in the bloodstream, and is excellent for lead as well as blood mercury and arsenic. DMPS targets similar metals but acts faster and binds body mercury with stronger affinity, at the cost of stronger reactions in sulfur-sensitive people. Neither crosses into the brain.

Q: Which chelator removes aluminium? A: None of the standard thiol chelators. DMSA, DMPS and ALA are sulfur-based and do not bind aluminium meaningfully. Aluminium responds to a different set of tools: silica water, diatomaceous earth, malic acid, lactoferrin, orthosilicic acid, and fulvic or humic complexes.

Q: Is EDTA a mercury chelator? A: No. EDTA is a weak binder for mercury and arsenic, mediocre for lead, and ineffective for aluminium, despite being widely marketed for heavy metal detox. Its genuine uses are calcium-based plaque and cardiovascular protocols, plus intravenous treatment of acute lead poisoning under hospital supervision.