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Selenium 200 mcg

Source Naturals
4.9
★ ★ ★ ★ ★
(5495 ratings)
Selenium 200 mcg
Product Image
Score87
A clear, economical L-selenomethionine tablet with a substantial dose that should not be stacked casually.
How scoring works
Quantity:120 Tablet(s) • (120 servings)
Goals:
General Health
Immunity

Score 87

A clear, economical L-selenomethionine tablet with a substantial dose that should not be stacked casually.
How scoring works
$9.27($0.07 per serving)
Pure Formulas
$ 9.27
Amazon
$ 13.18
iHerb
$ 10.05
iHerb
$ 10.05
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Analysis

The tablet provides 200 mcg selenium as L-selenomethionine. Dibasic calcium phosphate adds 37 mg calcium, but selenium remains the clear purpose.

The named organic form makes the product easy to compare with yeast or inorganic alternatives. Non-active tablet ingredients are not included in the supplied details.

The long supply supports inexpensive routine use. A lower-dose option may offer more flexibility for people already taking a multivitamin.

Who is it for
  • Adults intentionally seeking L-selenomethionine
  • People wanting a simple tablet
Best for
  • Targeted selenium intake
  • Long-term value

Pros

  • Uses L-selenomethionine
  • Clearly states 200 mcg selenium
  • Favorable routine value

Cons

  • Non-active ingredients are missing
  • Calcium contribution is minor
  • Dose allows limited stacking room

Warnings

  • Count the 200 mcg selenium amount with multivitamins and other selenium products to avoid unnecessary excess.

Nutrient quality

93 Highest impact

A well-absorbed organic form and meaningful amount provide strong targeted support. The small calcium carrier does not meaningfully distract from the focused design.

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Ingredient transparency

83 Highest impact

The selenium form and listed amounts are clearly disclosed without a hidden blend. Explicit use directions and non-active tablet ingredients are absent from the supplied data.

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Customer satisfaction

73 High impact

The available rating is strong and the sample is very large. Detailed feedback was not supplied, so repeated complaints and alignment with the intended use remain uncertain.

.

Value for money

97 Highest impact

A well-absorbed form and long supply deliver excellent value. The minor calcium carrier adds little cost or distraction.

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Goals

General Health
General Health
Impact
Highest effect
A- Goal FitA+ Strength of SupportC+ CoverageA Formula Quality
Selenium · 200 mcg

L-selenomethionine provides a well-absorbed source of an essential antioxidant and thyroid-supporting mineral. Its purposeful dose and precise disclosure make the formula easy to assess.

The benefit is focused rather than comprehensive because one trace mineral covers only a small part of general wellness. Users taking selenium from other supplements should account for their combined intake because the serving is already substantial.

Study evidence
Selenium Supportive 70 studies
Immunity
Immunity
Impact
Highest effect
B+ Goal FitA+ Strength of SupportC CoverageA+ Formula Quality
Selenium · 200 mcg

L-selenomethionine provides a highly bioavailable selenium source for antioxidant enzymes that support immune function. The amount is fully disclosed and well aligned with focused selenium use.

Strong depth and transparency make it useful for a defined selenium need, but a single mineral cannot provide broad immune coverage. The small calcium carrier does not materially distract from the focused design.

Study evidence
Selenium Mixed 37 studies

Ingredients

IngredientAmount per serving
Calcium (Dibasic Calcium Phosphate)
 37 mg
Selenium (L-Selenomethionine)
 200 mcg
Gluten Free Adults 18–50 Dairy Free Sugar Free Vegetarian
Report overview
Selenium (L-Selenomethionine) · 200 mcg OverallScore100
A+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

L-selenomethionine is a highly bioavailable organic form with precise label disclosure. The dose matches the preferred target while retaining a useful safety margin below the upper limit. The low serving cost makes it a strong value for a standalone selenium supplement.

View ingredientView products
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87 Performance

Selenium 200 mcg

Nature's Way
<p>Its label clearly provides 200 mcg of Selenium as L-Selenomethionine, making it a more clearly defined selenium option. Compared with the original, its ingredient and goal alignment is stronger, although the input does not provide independent testing or absorption evidence.</p>
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Selenium 200 mcg

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<p>Its label clearly provides 200 mcg of Selenium as L-Selenomethionine, making it a more clearly defined selenium option. Compared with the original, its ingredient and goal alignment is stronger, although the input does not provide independent testing or absorption evidence.</p>
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Selenium 200 mcg

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<p>Its label clearly provides 200 mcg of Selenium as L-Selenomethionine, making it a more clearly defined selenium option. Compared with the original, its ingredient and goal alignment is stronger, although the input does not provide independent testing or absorption evidence.</p>
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SelenoExcell 200 mcg

Swanson Ultra
<p>Its label clearly provides 200 mcg of Selenium as SelenoExcell organically bound high-Selenium Yeast, preserving relevant selenium coverage. Compared with the original, it lowers the serving cost, although the input does not provide independent testing or absorption evidence.</p>
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Selenium 100 mcg

Swanson
<p>Its label clearly provides 100 mcg of Selenium as Selenium SeLECT L-Selenomethionine, preserving relevant selenium coverage. Compared with the original, it lowers the serving cost, although the input does not provide independent testing or absorption evidence.</p>
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Selenium 200 mcg

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<p>Its label clearly provides 200 mcg of Selenium as SelenoExcell High Selenium Yeast, preserving relevant selenium coverage. Compared with the original, it lowers the serving cost, although the input does not provide independent testing or absorption evidence.</p>
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Selenium 200 mcg

NOW
<p>Its label clearly provides 200 mcg of Selenium as L-Selenomethionine, keeping the formula relevant to selenium. Compared with the original, the lower serving cost and ingredient detail create a useful quality-to-cost balance, although the input does not provide independent testing or absorption evidence.</p>
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Selenium 200 mcg

Solgar
<p>Its label clearly provides 200 mcg of Selenium as L-Selenomethionine, keeping the formula relevant to selenium. Compared with the original, the similar serving economics and ingredient detail create a useful quality-to-cost balance, although the input does not provide independent testing or absorption evidence.</p>
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SeMSC Selenium 200 mcg

Swanson
<p>Its label clearly provides 200 mcg of Selenium as L-Se-Methylselenocysteine, keeping the formula relevant to selenium. Compared with the original, the lower serving cost and ingredient detail create a useful quality-to-cost balance, although the input does not provide independent testing or absorption evidence.</p>
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Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Associations of selenium status with all-cause and cause-specific mortality: a systematic review and meta-analysis of cohort studies.
    Cui Z; Xie R; Lu X; Schomburg L; Brenner H; Schöttker B · Redox biology · 2025
    Meta-analysis95 participants20 studies pooledGeneral Health forSelenium
  2. Dietary Antioxidants, Circulating Antioxidant Concentrations, Total Antioxidant Capacity, and Risk of All-Cause Mortality: A Systematic Review and Dose-Response Meta-Analysis of Prospective Observational Studies.
    Jayedi A; Rashidy-Pour A; Parohan M; Zargar MS; Shab-Bidar S · Advances in nutrition (Bethesda, Md.) · 2019
    Meta-analysis507,251 participants41 studies pooledGeneral Health forSelenium
  3. The efficacy and safety of selenium supplementation versus placebo in the treatment of Graves' orbitopathy: A systematic review and meta-analysis of randomised controlled trials.
    Sharabati I; Qafesha RM; Hindawi MD; Amro S; Ayesh BM · Clinical endocrinology · 2024
    Meta-analysis4 studies pooledGeneral Health forSelenium
  4. Associations of plasma metal concentrations with the risks of all-cause and cardiovascular disease mortality in Chinese adults.
    Shi L; Yuan Y; Xiao Y; Long P; Li W; Yu Y; Liu Y; Liu K; Wang H; Zhou L; Yang H; Li X; He M; Wu T · Environment international · 2021
    Cohort study6,155 participantsGeneral Health forSelenium
  5. Updates on clinical studies of selenium supplementation in radiotherapy.
    Puspitasari IM; Abdulah R; Yamazaki C; Kameo S; Nakano T; Koyama H · Radiation oncology (London, England) · 2015
    Systematic review16 studies pooledGeneral Health forSelenium
  6. Effects of selenium supplementation on selenoprotein gene expression and response to influenza vaccine challenge: a randomised controlled trial.
    Goldson AJ; Fairweather-Tait SJ; Armah CN; Bao Y; Broadley MR; Dainty JR; Furniss C; Hart DJ; Teucher B; Hurst R · PloS one · 2011
    Randomized trial119 participantsImmunity forSelenium
  7. Effect of selenium on immune response against hepatitis B vaccine with accelerated method in insulin-dependent diabetes mellitus patients.
    Janbakhsh A; Mansouri F; Vaziri S; Sayad B; Afsharian M; Rahimi M; Shahebrahimi K; Salari F · Caspian journal of internal medicine · 2013
    Randomized trial62 participantsImmunity forSelenium
  8. Chemoprevention trial of human hepatitis with selenium supplementation in China.
    Yu SY; Li WG; Zhu YJ; Yu WP; Hou C · Biological trace element research · 1990
    Non-randomized trial20,847 participantsImmunity forSelenium
  9. Selenium nanoparticles as adjunctive therapy in sepsis: A pilot randomized clinical trial.
    Gu WJ; Huang W; Zhao FZ; Yuan XK; Jin K; Chen JL; Zhang CY; Huang Y; He L; Zhuang H; Yin HY; Chen T · Drug resistance updates : reviews and commentaries in antimicrobial and anticancer chemotherapy · 2026
    Randomized trial70 participantsImmunity forSelenium
  10. Selenium supplementation in patients with autoimmune thyroiditis decreases thyroid peroxidase antibodies concentrations.
    Gärtner R; Gasnier BC; Dietrich JW; Krebs B; Angstwurm MW · The Journal of clinical endocrinology and metabolism · 2002
    Randomized trial70 participantsImmunity forSelenium