Cesium
Cesium is a soft alkali metal that occurs in trace amounts in the environment. It has no known role in human nutrition.
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
Why cesium needs a clear warning
The FDA advises against supplements containing cesium chloride or any other cesium salt because of heart toxicity and possible death. 1
Which cesium is this?
Cesium is an alkali metal. Nonradioactive cesium chloride sold as an alternative treatment is distinct from radioactive cesium used in radiation therapy. 2
Why people take it
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Questions people ask
Is a different cesium salt a safer alternative?
The FDA warning covers cesium chloride and other cesium salts. 1
Is cesium chloride the same as radiation treatment?
No. The supplement salt is nonradioactive; radioactive cesium has a separate medical use. 2
Is there an established cancer-treatment dose?
The FDA has not established cesium salts as safe and effective cancer treatments. 3
Does being sold as a supplement mean FDA approval?
No. The FDA describes the marketed cesium-chloride supplements in its assessment as adulterated. 3
Sources
- Public Health Alert Concerning Dietary Supplements Containing Cesium Salts US Food and Drug Administration, 2020
- Cesium Chloride Memorial Sloan Kettering Cancer Center
- Cesium Chloride in Dietary Supplements US Food and Drug Administration
