VitaminDB Data · October 2026
The real cost of Selenium, per dose
For the exact same amount of Selenium — the same mcg of active ingredient — the priciest products cost a 4.7× premium over the cheapest. We measured it across 48 tracked products, normalized to cost per mcg.
Is the premium brand worth it?
On price, usually not. Two bottles of Selenium can carry the identical active dose at wildly different prices — the spread between the cheap and the premium end is 4.7× per mcg, from a low around $0.0002 to a high near $0.0010. A higher sticker price is not a reliable signal of a better product; most of that gap is branding and margin, not more Selenium. Pay up only for a verifiable difference — third-party testing, or a specific better-absorbed form — never for the packaging.
Right now the best value in our catalog is NOW Foods Supplements, Selenium (L-Selenomethionine)… at $0.03 per serving — against a catalog median of $0.075/serving.
How we calculated it
Cost per active unit = price ÷ (servings per container × dose per serving), measured in Selenium’s dominant dose unit (mcg) so we only ever compare like with like — mcg of Selenium against mcg of Selenium.
Spread = the 90th-percentile cost per mcg ÷ the 10th-percentile. Using the 10th/90th percentiles (not the absolute min/max) deliberately excludes one-off outliers and mislabeled listings. Based on 48 active Selenium products from our live Amazon US catalog, recomputed hourly. This is a value comparison, not medical or dosing advice.
Part of the catalog-wide supplement price-spread study (median 7.3× across 75 nutrients).
Free to cite
Quote these figures with a link back to this page. Key data point (as of October 2026): for the same dose of Selenium, the priciest products cost 4.7× more than the cheapest per mcg, across 48 tracked products.
Selenium cost FAQ
- How much does Selenium vary in price for the same dose?
- For the same amount of Selenium (per mcg), the most expensive products cost about 4.7× more than the cheapest — based on 48 tracked products, comparing the 90th vs 10th percentile cost per mcg. The median is $0.0005 per mcg.
- Is the premium Selenium brand worth it?
- On price alone, usually not: the priciest options deliver the same mcg of Selenium for up to 4.7× the cost. A higher price is not a reliable quality signal — pay more only for a verifiable difference such as third-party testing or a specific better-absorbed form, not for packaging.
- What is the cheapest Selenium per dose right now?
- NOW Foods Supplements, Selenium (L-Selenomethionine) 100 mcg, Essential… at $0.03 per serving is the lowest cost-per-dose Selenium in our catalog. See the full ranking on the Best Selenium page.