Supplement analysis backed by scientific evidence · PT

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Limited evidenceGeneral health

Oral EDTA

A genuine chelating agent, sold in capsules for "metal detox" and artery cleaning. Intravenous EDTA has been tested properly and failed; the oral form is poorly absorbed and has never been shown to lower body metal burden or improve any clinical outcome.

Evidence last reviewed: August 2026

What the science says

  • Cardiovascular benefit Moderate evidence

    TACT2, a large randomised trial of intravenous edetate disodium chelation in people with previous myocardial infarction and diabetes, found no reduction in cardiovascular events. This is high-quality evidence against the strongest version of the chelation hypothesis, using the more potent intravenous route.

  • Removing heavy metals by mouth Limited evidence

    EDTA is a charged molecule with very poor oral bioavailability, and reviews of the scientific basis for chelation describe efficacy in terms of parenteral dosing regimens in animals and patients. No trial shows that oral EDTA capsules meaningfully reduce blood or tissue lead.

  • Chelation for developmental and "toxicity" symptoms Moderate evidence

    A Cochrane review of chelation for autism spectrum disorder found no supporting evidence and recorded serious harms. Chelation given for vague symptoms rather than confirmed poisoning has consistently failed to help and has caused deaths.

Dosage & safety

Studied doseProducts typically supply 250–1,000 mg of calcium disodium EDTA per capsule. No oral dose has been shown to lower toxic metal burden, and no evidence-based regimen exists.
SafetyChelators do not distinguish toxic metals from essential ones and can strip zinc, copper, iron, calcium and magnesium. Disodium EDTA given wrongly has caused fatal hypocalcaemia; this is a real, documented mode of death in chelation practice. Kidney impairment is a further risk. It can bind and reduce absorption of minerals and drugs taken at the same time. Confirmed metal poisoning must be treated by a clinician with the correct agent, dose and monitoring — never with a supplement.

Scientific references

Where to buy

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