Se-Methyl L-Selenocysteine 200 mcg

Se-Methyl L-Selenocysteine 200 mcg

Life Extension4.9 (3,227 ratings)
Format:Capsule Quantity: 90 Capsule(s) · 90 servings
Goals
$8.25 $0.09 per serving

Product analysis

96 out of 100

Se-Methyl L-Selenocysteine 200 mcg supplies selenium for normal immune and antioxidant functions, with a favorable cost per serving. Its clearest benefit is filling a selenium gap.

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

Nutrient Quality100

Selenium has a favorable, clearly identified chemical form. That form quality does not establish extra immune benefits when selenium intake is already adequate.

Ingredient Transparency100

The selenium amount and form are clearly stated, making comparisons straightforward. The serving can be checked without having to infer the preparation.

Value For Money100

The selenium serving offers favorable value for its cost. That price advantage concerns the nutrient supplied rather than a guaranteed health effect.

Customer Satisfaction91

Customer ratings are very positive across a substantial set of reviews. The feedback describes satisfaction without establishing improved immunity or infection protection.

Product Focus84

The single nutrient has a clear role in normal antioxidant and immune functions when intake is low. People who already obtain enough selenium should not expect extra benefit from the substantial serving.

Format
Capsule
Container
90 Capsule(s)
Per serving
$0.09
Customer rating
4.9 · 3,227 ratings
Report analysis

Goals

Everyday Health
Impact
Highest effect
A+ Ingredient FitC PathwaysB+ EvidenceA+ Formulation Logic
Selenium · 200 mcg
Study evidence
Selenium Supportive 70 studies
Immunity
Impact
Highest effect
A+ Ingredient FitD+ PathwaysA- EvidenceA+ Formulation Logic
Selenium · 200 mcg
Study evidence
Selenium Mixed 37 studies

Ingredients

IngredientAmount per servingScore
Selenium (Se-Methyl L-Selenocysteine)
200 mcg 100
Adults 18–50
Report overview
A+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value
A serving provides 200 mcg of selenium, with a low product cost per 200 mcg. The amount is below the adult upper intake level. It lists Se-Methyl-L-Selenocysteine.
How this ingredient is rated

Active Ingredient Quality & Bioavailability100

It lists Se-Methyl-L-Selenocysteine.
Selenium Chemical Form
It lists Se-Methyl-L-Selenocysteine.
Form Transparency & Isomer Specificity
The label identifies Se-Methyl-L-Selenocysteine.

Dose, Safety & Label Transparency100

The serving provides 200 mcg, an amount used in research on antioxidant and thyroid support. The 200 mcg serving is below the 400 mcg adult upper intake level, leaving room for dietary selenium.
Dosage Efficacy Sweet Spot
The serving provides 200 mcg, an amount used in research on antioxidant and thyroid support.
Safety Margin & UL Adherence
The 200 mcg serving is below the 400 mcg adult upper intake level, leaving room for dietary selenium.

Value100

The product cost per 200 mcg of selenium is low.
Price per 200 mcg Serving
The product cost per 200 mcg of selenium is low.
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