Best Selenium Supplements 2026: Cost per Effective Dose
Top pick for Selenium: NOW Supplements Selenium 200mcg — 200mcg per 1 capsule, $0.07/day. Our best-value pick.
Registry check · Selenium
Does anyone independently verify Selenium supplements?
We did not find any of these products in a public registry, and none of the listings names a certification mark. Where a listing names a mark, we say so in the table; where we could not find it in a registry, we say that instead.
The 2 products on this page 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 |
|---|---|---|---|---|---|---|
| NOW Supplements Selenium 200mcg | NOW Foods | 200mcg / 1 capsule | $0.07 | None | Best Value | 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
Best Value: NOW Supplements Selenium 200mcg
200mcg per 1 capsule. $0.07/day. 180 servings per container at $12.24.
How these 2 Selenium products were ranked
Not one of these 2 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.