Selenium
Trace element that forms part of enzymes protecting cells against oxidative damage.
What the research shows
Mixed or small evidence. The effect is uncertain.
The Cochrane review by Vinceti (2018) found no lower cancer risk in randomised trials and saw more cases of type 2 diabetes among users. Huwiler (2024) saw lower thyroid antibodies in Hashimoto disease, a lab value that says nothing yet about symptoms. In well-fed people no benefit has been demonstrated.
Who it makes sense for: People with a low selenium intake, and possibly people with Hashimoto disease under medical supervision.
How we weigh evidenceClinical dosage
Scientific sources
The clinical dosages on this page are based on peer-reviewed research.
- Selenium for preventing cancer.Vinceti M et al. (2018)
- Selenium Supplementation in Patients with Hashimoto Thyroiditis: A Systematic Review and Meta-Analysis of Randomized Clinical Trials.Huwiler VV et al. (2024)
We keep the dosages and values on this page as accurate as possible based on selected studies. New research may change these values. Nothing on this page is medical advice. If you have any doubts, always consult a doctor.