Best Selenium Supplements 2026: Cost per Effective Dose
Top pick for Selenium: Life Extension Super Selenium Complex — 200mcg per 1 capsule, $0.11/day.
Registry check · Selenium
Does anyone independently verify Selenium supplements?
We could not confirm a single one of these 2 products in any registry, and none of them claims otherwise. Not one brand here displays a certification mark, so on independent verification all 2 start level.
2 checked against all 5,317 US NSF, USP and Informed Sport listings, 2026-08-25. Full method and limitations.
All Selenium Supplements Compared
| Product | Brand | Dose / Serving | Cost / Day | Certification (as labelled) | Pick | Buy |
|---|---|---|---|---|---|---|
| Life Extension Super Selenium Complex | Life Extension | 200mcg / 1 capsule | $0.11 | None | Buy |
In-Depth Selenium Guides
Go deeper on selenium — by goal, by form, and what the evidence actually supports:
Our Picks
Lowest Cost: Life Extension Super Selenium Complex
200mcg per 1 capsule. $0.11/day. 100 servings per container at $10.50.
The evidence · Selenium
What the published reviews of Selenium concluded
- Clinical efficacy of selenium supplementation in patients with Hashimoto thyroiditis: A systematic review and meta-analysis. · Medicine, 2025
“Se supplementation help reduce TPOAb and TSH levels in HT patients, leading to improvements in well-being or mood. Selenomethionine is more effective than NaSe and Se-yeast in the teatment of Hashimoto thyroid.”
- Minerals and Sarcopenia; The Role of Calcium, Iron, Magnesium, Phosphorus, Potassium, Selenium, Sodium, and Zinc on Muscle Mass, Muscle Strength, and Physical Performance in Older Adults: A Systematic Review. · Journal of the American Medical Directors Association, 2018
“Minerals may be important nutrients to prevent and/or treat sarcopenia. Particularly, magnesium, selenium, and calcium seem to be most promising. Most of the included studies, however, were observational studies.”
- Selenium levels and skin diseases: systematic review and meta-analysis. · Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS), 2020
“Selenium levels were associated with several skin diseases and the disease severity, and high selenium levels tended to be a protective factor in certain skin diseases.”
- A systematic review of Selenium as a complementary treatment in cancer patients. · Complementary therapies in medicine, 2024
“Due to the very heterogeneous results and methodical limitations of the included studies, a clear statement regarding the effectiveness of Se supplementation is not possible, whereas cancer patients with a Se deficiency could profit from a Se supplementation during radio- or chemotherapy.”
Method: PubMed searched in humans for systematic reviews and meta-analyses with Selenium in the title; these 4 of the 7 that qualified are shown with the authors’ own conclusion quoted rather than summarised. What it cannot tell you: whether Selenium will work for you — each of these reports an average across trials published 2018–2025, and null findings are shown here as readily as positive ones.
How these 1 Selenium products were ranked
Not one of these 1 selenium products could be confirmed in the NSF, USP or Informed Sport registries, so verification separates none of them and the ranking falls to cost per day at the labelled serving. Commission does not enter it: the rate is the same whichever selenium you buy. Full methodology.