Chelation Therapy for Heavy Metal Toxicity: Tests, How It Works and Safety

In short: Chelation therapy is a medical treatment for confirmed heavy metal poisoning, such as high lead levels. A prescribed medicine binds the metal in the blood so the body can pass it out, mostly in urine. It starts with a proper test and removing the source of exposure, and it needs a doctor's supervision because it has real risks.

What is chelation therapy?

Chelation (say "kee-LAY-shun") comes from the Greek word for a claw. A chelating agent is a medicine whose molecule grips a metal atom from several sides, like a claw. The metal is then held in a stable, less harmful bundle that the kidneys can filter out.

Each metal reacts differently, so each needs a matching chelating agent. There is no single medicine that removes every metal.

Who might need chelation?

Chelation is for people whose tests confirm a harmful level of a toxic metal, usually along with symptoms or a clear exposure. It is not a general "detox", and it is not used to clear "toxins" in people without a diagnosed metal problem.

Metal exposure in India is common enough to take seriously:

• Lead. A review of 31 Indian studies, covering 5,472 people in nine states, found an average blood lead level of 6.86 micrograms per decilitre (µg/dL) in children and 7.52 µg/dL in adults without work exposure. The World Health Organization (WHO) says there is no known safe level of lead, and advises finding and stopping the source at 5 µg/dL or above. This is a trigger to investigate and stop exposure, not a threshold for chelation. Treatment decisions depend on the metal, concentration, symptoms and individual circumstances.

• Some traditional medicines. At a hospital in Punjab, 786 adults with unexplained stomach pain had a blood lead test. 75 had high levels, and 73 of them had taken Ayurvedic medicines. Lead in the samples tested was far above permitted limits.

• Work and surroundings. Battery recycling, smelting, paint stripping, some cosmetics, ceramic glazes and contaminated dust, soil or water are known sources of lead.

• Arsenic is found in groundwater in parts of West Bengal.

Detecting a metal does not automatically establish poisoning or a need for chelation.

Symptoms of metal toxicity are often vague: tiredness, stomach pain, constipation, anaemia (low red blood cells), aches, poor sleep or changes in mood and concentration. Many other conditions cause these too, which is why testing matters. SOMA has also written about strontium exposure in India.

How is heavy metal exposure tested?

Testing starts with your history. A doctor asks about your work, home, water source, hobbies, cookware, cosmetics, supplements and any traditional medicines.

Blood tests. WHO states that lead exposure is assessed by measuring lead in the blood. Blood also shows recent exposure to several other metals.

Urine tests. Some metals leave the body mainly in urine, so a timed urine sample, such as a 24-hour collection, can show how much is being passed out.

Choosing the right test. Doctors select validated blood or urine tests for the suspected metal, based on your history and symptoms.

Other checks. Kidney and liver function tests, a blood count and mineral levels help a doctor judge the effects of a metal and whether treatment would be safe.

What is a "provoked" urine test, and is it reliable?

In a provoked urine test, also called a challenge test, a chelating agent is given first and urine is collected afterwards. The idea is to pull out stored metal and measure it.

A review in the Journal of Medical Toxicology concluded that these tests should not be used to diagnose metal toxicity. There is no standard version and no normal range for healthy people. Chelating agents raise metal levels in almost anyone's urine, whatever their exposure. A "high" result can therefore look alarming without meaning much. Ask how any test you are offered was validated.

How does chelation work in the body?

1. The medicine enters the blood. Depending on the agent, it is taken by mouth or given by drip or injection.

2. It grips the metal. The chelating agent binds metal circulating in the blood and the fluid around cells. Most agents do not enter cells easily.

3. The kidneys filter it out. The bundle of agent and metal leaves the body mainly in urine. This is why kidney function is checked first.

4. Stores can refill the blood. Lead is stored in bone and can be released into the blood over time. Doctors therefore retest after a course before deciding on more.

Which agent a doctor chooses depends on the metal:

• DMSA (succimer): taken by mouth. Used for lead, and also for arsenic and mercury.

• Calcium disodium EDTA: given by drip. Used mainly for lead.

• Dimercaprol (also called BAL): injected into muscle. Used for selected arsenic or inorganic mercury poisoning, and with calcium disodium EDTA for severe lead poisoning. It should not be used for organic mercury poisoning (a different chemical form of mercury), because it can carry more mercury into the brain.

• D-penicillamine: taken by mouth. Used for copper build-up and, in some settings, for lead. In the Punjab study, stopping the medicines and chelation with d-penicillamine lowered blood lead and improved symptoms in all 73 patients within three to four months.

Stopping exposure is essential. Severe poisoning may require urgent hospital treatment while the source is being identified and removed.

What are the risks of chelation?

Chelation uses strong medicines, and the risks are real:

• Loss of useful minerals. Long courses of EDTA can lower zinc, copper and manganese. Doctors may check these and replace them.

• Kidney strain. EDTA can harm the kidneys at high doses. Kidney function is checked before and during treatment.

• Metal moving to the wrong place. EDTA and dimercaprol can shift some lead or arsenic into the brain and other tissues if used without care.

• Possible side effects. These include stomach upset, skin rash, raised liver enzymes and a fall in white blood cells with DMSA.

• Serious reactions. Between 2003 and 2005, three deaths in the United States were caused by a sharp fall in blood calcium during chelation. Two were children given edetate disodium, a different form of EDTA from the calcium form used for lead. A mix-up between the two can be fatal.

### What should a doctor screen for first?

These are screening points for a doctor to consider, not a complete list:

• kidney or liver disease

• pregnancy or breastfeeding

• low calcium, low zinc or other mineral deficiencies

• G6PD deficiency (an inherited enzyme condition), because dimercaprol can trigger red blood cell breakdown

• allergy to the chosen agent, or to penicillin (for d-penicillamine)

• all current medicines and supplements

• whether the source of exposure has been found and stopped

How does a SOMA doctor decide what is right for you?

At SOMA, a doctor looks at the whole picture first. Tiredness, aches and poor sleep can come from metals, but also from thyroid, nutrition, hormones or long-term inflammation. Which tests you need depends on your history and what the doctor finds.

If testing confirms a metal problem, your doctor explains the results, helps find the source and discusses the options with you. These may include removing the exposure, correcting nutrition and mineral balance, monitoring, or prescribed chelation where it is suitable. You get a clear plan, with what to retest and when, as one part of a plan built around you.

SOMA centres in Mumbai and New Delhi

SOMA doctors see patients at two centres:

• Mumbai: A-507, Kohinoor Square, N.C. Kelkar Marg, Shivaji Park, Dadar West, Mumbai 400028. Phone +91 98671 94033.

• New Delhi: E-354, Greater Kailash II, New Delhi 110048, serving Delhi NCR and Gurugram. Phone +91 87969 92001. More about the New Delhi centre.

The New Delhi centre is independently operated under licence from SOMA Longevity Sciences, and its own doctors lead care there. Both centres follow the same SOMA assessment and diagnostic standards. Online consultations are also available. Contact either centre.

Questions people ask

What is chelation therapy used for?

Chelation therapy is used to remove toxic metals, such as lead, arsenic or mercury, from people whose tests confirm a harmful level. A prescribed medicine binds the metal so the kidneys can pass it out in urine. It is not a general detox.

Is chelation therapy safe?

When a doctor chooses the right agent, checks kidney function and minerals, and monitors you, chelation is an established treatment for metal poisoning. It can cause mineral loss, kidney strain and serious reactions such as a dangerous fall in calcium. It should never be taken without medical supervision.

How do I know if I have heavy metal toxicity?

Symptoms are often vague, so a test is needed. A blood test is the standard way to measure lead. Other metals require appropriately selected blood or urine tests, read alongside your history of exposure.

Are provoked urine tests accurate?

A review in the Journal of Medical Toxicology advised against using them to diagnose metal toxicity. Chelating agents raise metal levels in most people's urine, and there is no normal range to compare results with.

Where can I get tested for heavy metals in Mumbai or Delhi?

Start with a doctor's assessment rather than an online test kit. Doctors at SOMA's centres in Dadar West, Mumbai and Greater Kailash II, New Delhi review your symptoms and exposure history, arrange appropriate tests and discuss the options with you.

Sources

1. World Health Organization. Lead poisoning (fact sheet). WHO, updated 10 June 2026. https://www.who.int/news-room/fact-sheets/detail/lead-poisoning-and-health

2. Ericson B, Dowling R, Dey S, et al. A meta-analysis of blood lead levels in India and the attributable burden of disease. Environment International 2018;121(Pt 1):461–470. https://pubmed.ncbi.nlm.nih.gov/30273869/

3. Mehta V, Midha V, Mahajan R, et al. Lead intoxication due to ayurvedic medications as a cause of abdominal pain in adults. Clinical Toxicology 2017;55(2):97–101. https://pubmed.ncbi.nlm.nih.gov/27957879/

4. Flora SJS, Pachauri V. Chelation in metal intoxication. International Journal of Environmental Research and Public Health 2010;7(7):2745–2788. https://pubmed.ncbi.nlm.nih.gov/20717537/

5. Kim JJ, Kim YS, Kumar V. Heavy metal toxicity: an update of chelating therapeutic strategies. Journal of Trace Elements in Medicine and Biology 2019;54:226–231. https://pubmed.ncbi.nlm.nih.gov/31109617/

6. Ruha AM. Recommendations for provoked challenge urine testing. Journal of Medical Toxicology 2013;9(4):318–325. https://pubmed.ncbi.nlm.nih.gov/24113861/

7. Brown MJ, Willis T, Omalu B, Leiker R. Deaths resulting from hypocalcemia after administration of edetate disodium: 2003–2005. Pediatrics 2006;118(2):e534–e536. https://pubmed.ncbi.nlm.nih.gov/16882789/

8. World Health Organization. WHO guideline for clinical management of exposure to lead. Geneva: WHO; 2021. ISBN 978-92-4-003704-5. https://www.who.int/publications/i/item/9789240037045