What is the best form of selenium?
3 forms compared by what actually reaches your bloodstream. Absorption ranges from 85% to 95% — a difference that matters more than the milligrams on the label.
Ranked by absorption
Higher means more of the dose reaches youShort answer
Selenium (Selenomethionine) absorbs best — 95%.
Superior antioxidant & thyroid support. Typical dose 100-200 mcg, about $15 a month.
Every form side by side
| Form | Absorbed | Safety | Per month | Dose | Evidence |
|---|---|---|---|---|---|
| Selenium (Selenomethionine) | 95% | 7/10 | $15 | 100-200 mcg | A |
| Selenium (Thyroid Support) | 85% | 8/10 | $15 | 100-200mcg | A |
| Selenium for Thyroid Health and Hormone Conversion | 85% | 8/10 | $25 | 100-200mcg daily | A |
Head to head
How to read this
- Absorption is the share of the dose that reaches your bloodstream — the number that decides whether the milligrams on the label mean anything.
- A cheaper form at half the absorption is not cheaper per unit delivered.
- Safety here reflects tolerance at normal doses, not toxicity risk.
- Evidence A means the form itself was studied, not just the parent compound.
Common questions
What is the best form of selenium?
Selenium (Selenomethionine) — it absorbs at 95%, the highest of the 3 forms here. Superior antioxidant & thyroid support. Typical dose 100-200 mcg.
Which form of selenium is worst absorbed?
Selenium for Thyroid Health and Hormone Conversion at 85%. It is usually the cheapest option, which is exactly why it ends up in budget products.
Is the expensive form of selenium worth it?
Compare per unit delivered, not per bottle. Selenium (Selenomethionine) costs $15 a month at 95% absorption, Selenium (Selenomethionine) costs $15 at 95%.
How much selenium should you take?
Doses differ by form: Selenium (Selenomethionine) 100-200 mcg; Selenium (Thyroid Support) 100-200mcg; Selenium for Thyroid Health and Hormone Conversion 100-200mcg daily.