Chelation Therapy.

What it is

Chelation therapy uses a chelating drug, such as DMSA by mouth or EDTA given by IV, that binds to heavy metals so the body can clear them through the urine. It was developed to treat lead poisoning and is also used for other toxic metals, such as mercury and cadmium, when a validated test, such as a blood lead level, shows a high level. The FDA says every approved chelation product requires a prescription and can only be used safely under a clinician's supervision.

Some integrative practitioners also use EDTA chelation for heart disease. In the NIH-funded TACT trial (1,708 people after a heart attack, reported in 2013), it produced a modest drop in cardiovascular events, seen only in people with diabetes; TACT2 (959 people with diabetes and a prior heart attack, reported in 2024) found no benefit, with events in 35.6% on EDTA and 35.7% on placebo. NCCIH says these findings don't support chelation to lower cardiovascular risk, and it is not FDA-approved for heart disease.

What happens at a visit

1. Lab work first, including kidney function and a validated heavy metal test.
2. A chelating drug by mouth or an IV infusion, such as EDTA over 1.5 to 3 hours.
3. Minerals given to replace those removed along with the metals.
4. You may feel tired or lightheaded during or after.
5. You'll likely urinate more as the metals clear.
6. Repeat blood tests to check levels, kidney function and calcium, with the plan set by the treating clinician.

Who it is for

• People with confirmed heavy metal poisoning, such as high blood lead levels
• People with heavy work or environmental metal exposure whose validated test shows a high level
• People with heart disease asking about chelation, who should discuss TACT2's results with their cardiologist first
• People whose symptoms may link to metal exposure, after a validated test (not a provoked urine test)
• People working with a clinician experienced in chelation, such as a medical toxicologist

Evidence and safety

Evidence is strong for confirmed heavy metal poisoning, such as high lead levels, where prescription chelating drugs are FDA-approved. For heart disease it is not supported: TACT found a modest benefit only in people with diabetes, and the larger follow-up, TACT2, found none, so NCCIH says the findings don't support chelation to lower cardiovascular risk. It is not a recommendation for anyone without a confirmed poisoning. The FDA has never approved any chelation product for over-the-counter use and warns chelation can cause dehydration, kidney failure and death. EDTA's most serious side effects are dangerously low blood calcium and kidney damage, and CDC reported three deaths from low calcium during chelation from 2003 to 2005. It must be given by an experienced clinician with lab monitoring, and people with kidney disease or who are pregnant need specialist advice first.

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