Selenium 200 mcg

Selenium 200 mcg

NOW4.8 (23,794 ratings)
Format:Capsule Quantity: 90 Capsule(s) · 90 servings
Goals
$6.40 $0.07 per serving

Product analysis

97 out of 100

Selenium 200 mcg can help fill a selenium gap, supporting normal immune function and antioxidant defenses. Its clearly identified form and favorable value make comparison with other selenium supplements straightforward.

AI assessment of the formula, label and price. How scoring works

Nutrient Quality100

Selenium uses L-selenomethionine, a favorable form for ingredient quality. The clearly identified single source makes comparison with other selenium supplements straightforward.

Ingredient Transparency100

Both the selenium amount and its form are clearly stated. That makes the contents easy to compare with another selenium supplement.

Value For Money100

The selenium content offers favorable value for the serving cost. Its clearly named form also makes the price-and-quality comparison straightforward.

Customer Satisfaction94

Customer ratings are very positive across a large review base. That gives a broad picture of satisfaction.

Product Focus84

Selenium supports normal immune and antioxidant functions when intake falls short. The larger serving does not establish extra benefit when selenium needs are already met.

Format
Capsule
Container
90 Capsule(s)
Per serving
$0.07
Customer rating
4.8 · 23,794 ratings
Report analysis

Goals

Everyday Health
Impact
Highest effect
A+ Ingredient FitC PathwaysB+ EvidenceA+ Formulation Logic
Selenium · 200 mcg

Selenium supplies an essential nutrient used in normal enzyme functions. It may help fill a dietary gap, although most adults in the supplied context already obtain adequate selenium. The 200 mcg serving reaches the saved range; this does not establish extra antioxidant protection, disease prevention or greater benefit when selenium intake is already sufficient.

How this product is rated for Everyday Health

Ingredient fit97

Selenium is the sole ingredient considered for this goal.
Goal fit
Selenium is the sole ingredient considered for this goal.
Dose adequacy
The declared selenium amount reaches the saved range, without establishing added benefit above nutritional adequacy.

Pathways60

The saved finding is concentrated in antioxidant and immune-related nutrient functions.
Depth
The saved finding is concentrated in antioxidant and immune-related nutrient functions.
Breadth
Antioxidant and immune-related functions are the only substantially represented route.

Evidence82

Selenium leads the saved evidence finding. Declared selenium receives the saved preparation finding without a chemical-form superiority claim.
Evidence strength
Selenium leads the saved evidence finding; practical benefit remains conditional on nutritional availability and dietary gaps.
Studied preparation
Declared selenium receives the saved preparation finding without a chemical-form superiority claim.

Formulation logic100

Selenium meets the saved amount threshold. No configured conflict was identified.
Partner coverage
Every credited ingredient works alone or has its required partner in the saved findings.
Conflicts
No configured ingredient conflict was identified in the saved findings.
Effective doses
Selenium meets the saved amount threshold.
Study evidence
Selenium Supportive 70 studies
Immunity
Impact
Highest effect
A+ Ingredient FitD+ PathwaysA- EvidenceA+ Formulation Logic
Selenium · 200 mcg

Selenium supports normal immune function and the body's handling of oxidative stress. Its contribution is most relevant when intake is low; supplementation does not reliably improve selenium-dependent measures when status is already adequate. This serving supplies the declared nutrient in a known form, without evidence that the form itself adds immune benefit.

How this product is rated for Immunity

Ingredient fit97

Selenium is the single relevant active, with a clearly declared amount that meets the saved amount comparison.
Goal fit
The formula is concentrated on selenium rather than a mixture of unrelated actives.
Dose adequacy
The declared selenium amount meets the saved comparison; more does not establish greater immune benefit.

Pathways53

The strongest contribution is to oxidative balance, with a smaller link to immune regulation.
Depth
Selenium's main contribution is to oxidative and inflammatory balance.
Breadth
The support is concentrated in oxidative balance rather than spread broadly across immune functions.

Evidence85

Selenium has an established normal nutrient role; the supplied context limits expectations of additional benefit when intake is adequate.
Evidence strength
The evidence supports normal selenium-dependent immune function, with limited support for additional benefit in adequately nourished adults.
Studied preparation
The declared selenium form is accepted in the saved findings; no form superiority is established.

Formulation logic100

The recognized contributions do not require an extra partner, and the checked zinc conflicts do not apply.
Partner coverage
The recognized ingredients work without a required additional partner in the saved findings.
Conflicts
Neither checked zinc conflict is triggered by the supplied ingredient amounts and presence findings.
Effective doses
All ingredients recognized in this finding have meaningful amounts under the saved comparison; this is not proof of a clinical effective dose.
Study evidence
Selenium Mixed 37 studies

Ingredients

IngredientAmount per servingScore
Selenium (L-Selenomethionine)
200 mcg 100
Gluten Free Adults 18–50 Vegan Kosher Dairy Free Vegetarian
Report overview
A+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value
Each serving provides 200 mcg of selenium, matching the amount favored by the evaluation. It uses L-selenomethionine, a named form favored by the evaluation.
How this ingredient is rated

Active Ingredient Quality & Bioavailability100

The selenium is identified as L-selenomethionine, a specifically named form favored in the evaluation.
Selenium Chemical Form
L-selenomethionine is an organic form favored by the evaluation.
Form Transparency & Isomer Specificity
The name specifies the L form, giving a more precise identification than a generic source name.

Dose, Safety & Label Transparency100

The 200 mcg of selenium per serving matches the evaluation's favored amount and does not exceed its upper limit.
Dosage Efficacy Sweet Spot
The 200 mcg of selenium per serving matches the evaluation's favored amount.
Safety Margin & UL Adherence
The serving does not exceed the upper limit used in the evaluation; selenium from food also contributes to total intake.

Value100

The full-product price works out to about $0.07 per 200 mcg of selenium; it is a comparison figure, not a separate selenium price.
Price per 200 mcg Serving
The full-product price works out to about $0.07 per 200 mcg of selenium; it is a comparison figure, not a separate selenium price.
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 pooledEveryday 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 pooledEveryday 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 pooledEveryday 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 participantsEveryday 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 pooledEveryday 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