Product Image

Selenium 100 mcg

Source Naturals
4.8
★ ★ ★ ★ ★
(414 ratings)
Selenium 100 mcg
Product Image
Score84
An economical 100 mcg selenium-yeast tablet with a flexible dose and incomplete composition details.
How scoring works
Quantity:250 Tablet(s) • (250 servings)
Goals:
General Health
Immunity

Score 84

An economical 100 mcg selenium-yeast tablet with a flexible dose and incomplete composition details.
How scoring works

Also available as

1 option
200.00mcg • 120 servings Selenium 200 mcg • 120 Tablet(s) • 120 servings $8.97 ($0.07 per serving)
$12.59($0.05 per serving)
iHerb
$ 12.59
Report prices

Analysis

The tablet supplies 100 mcg selenium from selenium yeast. That moderate amount leaves more room for selenium already obtained from food or a multivitamin.

Selenium yeast can provide useful organic selenium compounds, but the exact composition is not stated. Full tablet ingredients are also absent from the supplied data.

The large tablet supply makes ongoing use economical. The lower dose may be easier to fit into a broader supplement routine than 200 mcg products.

Who is it for
  • Adults seeking a moderate selenium dose
  • People combining selenium with a broader routine
Best for
  • Maintenance selenium intake
  • Flexible supplement stacking

Pros

  • Moderate 100 mcg amount
  • Uses selenium yeast
  • Strong routine value

Cons

  • Exact yeast compounds are unknown
  • Tablet excipients are not shown
  • Narrow single-nutrient product

Warnings

  • Count the 100 mcg serving with selenium from other supplements.

Nutrient quality

89 Highest impact

A conservative amount and food-form yeast fit routine maintenance. Unspecified selenium compounds limit form precision, while the focused formula avoids filler.

.

Ingredient transparency

81 Highest impact

The active amount and yeast source are disclosed without a hidden blend. Specific selenium compounds, explicit use directions, and non-active ingredients are absent.

.

Customer satisfaction

65 High impact

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

.

Value for money

99 Highest impact

A very long supply delivers excellent value for maintenance use. Limited source precision is the main quality trade-off.

.
Report analysis

Goals

General Health
General Health
Impact
High effect
B Goal FitA- Strength of SupportC- CoverageA Formula Quality
Selenium · 100 mcg

Selenium yeast provides focused support for normal antioxidant enzymes and thyroid function. The maintenance serving leaves a comfortable margin below the upper intake limit.

The specific selenium compounds and source quality are not described. Its narrow role means it is most useful when selenium intake is low rather than as a broad general-health product.

Study evidence
Selenium Supportive 70 studies
Immunity
Immunity
Impact
High effect
C Goal FitB+ Strength of SupportD+ CoverageA Formula Quality
Selenium · 100 mcg

Selenium supports antioxidant enzymes and normal immune-cell function, and the 100 mcg amount is appropriate for daily maintenance. Selenium yeast offers good expected bioavailability.

The product supports one mineral-dependent antioxidant pathway rather than broad immunity. The label does not identify specific selenium compounds or a branded standardized yeast source.

Study evidence
Selenium Mixed 37 studies

Ingredients

IngredientAmount per serving
Selenium (Selenium Yeast)
 100 mcg
Gluten Free Adults 18–50 Dairy Free Vegetarian
Report overview
Selenium (Selenium Yeast) · 100 mcg OverallScore88
B+ Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyA+ Value

Selenium yeast offers a food-form source with good expected bioavailability, although the label does not identify a branded ingredient or specific selenium compounds. The 100 mcg serving supports daily maintenance and leaves a wide margin below the upper intake limit, but it is below the amount commonly used for targeted supplementation. A very low cost per equivalent dose makes it economical despite the limited source detail.

View ingredientView products
Loading alternative details
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>
87 Performance

Selenium 200 mcg

California Gold Nutrition
<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>
87 Performance

Selenium 200 mcg

NOW
<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>
87 Budget

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>
87 Budget

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>
85 Budget

Selenium 100 mcg

NOW
<p>Its label clearly provides 100 mcg of Selenium as 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>
87 Value

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 somewhat higher serving cost and ingredient detail create a useful quality-to-cost balance, although the input does not provide independent testing or absorption evidence.</p>
86 Value

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 somewhat higher serving cost and ingredient detail create a useful quality-to-cost balance, although the input does not provide independent testing or absorption evidence.</p>
86 Value

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 somewhat higher serving cost and ingredient detail create a useful quality-to-cost balance, although the input does not provide independent testing or absorption evidence.</p>
Report alternatives

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