LifeSource Vitamins Selenium 200 mcg β 90 Veg Capsules β Supports Thyroid & Immune Health*
High-bioavailability L-selenomethionine to support thyroid antibody balance and healthy immune activity. Produced in FDA-registered, GMP-certified facilities and 3rd-party tested for identity, potency & purity.*
Research-Driven & Verified Product.
Explore the clinical research, ingredient science, and global evidence supporting this product below.
Research Promise: At LifeSource Vitamins, our commitment is rooted in research and results. Every benefit below is supported by human clinical studies indexed in the National Institutes of Health (NIH) via PubMed, with full texts available in the National Library of Medicine (NLM) PubMed Central (PMC) when available. In addition, we reference reviews from 39 leading health organizations and insights from 20 top global universities to ensure our guidance aligns with credible science.*
Clinically Studied Benefits
β Supports thyroid autoimmunity β L-selenomethionine (200 ΞΌg/day) reduced thyroid peroxidase antibodies (TPOAb) and improved markers in autoimmune thyroiditis RCTs.
NIH/PubMed β de Farias, 2015
β Boosts immune cell activity β Double-blind RCT (200 ΞΌg/day) enhanced lymphocyte proliferation and natural killer cell activity in adults.
NIH/PubMed β Kiremidjian-Schumacher, 1994
β Improves sperm motility in men with low selenium β Randomized placebo-controlled trial reported improved motility and higher conception rate in subfertile men.
NIH/PubMed β Scott, 1998
β Supports thyroid antibody reduction in autoimmune thyroiditis β RCTs showed L-selenomethionine reduced TPOAb levels.
NIH/PubMed β Mantovani, 2019
β Improves thyroid markers in autoimmune thyroiditis β Selenium supplementation improved thyroid function in RCTs.
NIH/PubMed β Kyrgios, 2019
β Supports immune function in selenium insufficiency β Selenium improved cell-mediated and humoral immunity in low-status adults.
NIH/PubMed β Broome, 2006
β Supports thyroid health in autoimmune conditions β Systematic reviews/meta-analyses summarize selenium RCTs for thyroiditis.
NIH/PubMed β Huwiler, 2024
β Supports male fertility parameters β Selenium with vitamin E improved semen parameters in idiopathic infertility RCTs.
NIH/PMC β Moslemi, 2011
β Supports thyroid antibody balance β Selenium supplementation reduced antibodies in autoimmune thyroiditis.
NIH/PMC β van Zuuren, 2013
β Supports immune markers β Selenium enhanced immune responses in clinical contexts.
NIH/PMC β Ventura, 2017
Additional / Promising Evidence
β Thyroid context evidence syntheses β Systematic reviews summarize selenium RCTs for autoimmune thyroiditis.
NIH/PubMed β Huwiler, 2024
β Male fertility combination support β Selenium with vitamin E improved semen parameters in infertility RCTs.
NIH/PMC β Moslemi, 2011
β Selenium & selenoproteins in thyroid/immune roles β Evidence overviews on selenium functions.
NIH/PMC β Ventura, 2017
University-Led & Academic Studies
β Academic thyroid autoimmunity RCTs β L-selenomethionine reduced TPOAb in autoimmune thyroiditis.
NIH/PubMed β de Farias, 2015
β University immune cell activity RCT β Selenium enhanced lymphocyte and NK cell activity.
NIH/PubMed β Kiremidjian-Schumacher, 1994
β Academic male fertility RCT β Selenium improved sperm motility in subfertile men.
NIH/PubMed β Scott, 1998
We monitor research from leading institutions β
Harvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge, Oxford, Stanford, Yale, Tufts, University of Florida, Oregon State University β Linus Pauling Institute, Columbia, Cornell, Ohio State β to align with credible science.*
Key Ingredients
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L-Selenomethionine β Organic selenium form studied in RCTs for thyroid antibodies and immune function (NIH/PubMed β de Farias, 2015).
Brief Benefit Bullets
- Supports thyroid antibody balance in autoimmune thyroiditis*
- Helps maintain healthy immune cell activity*
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3rd-party lab tested for identity, potency & purity
Suggested Use
Take 1 capsule daily with a meal, or as directed by your healthcare professional. Do not exceed a total of 400 mcg/day from all sources. If pregnant, nursing, taking medications, or have a medical condition, consult your physician.*
Product Specifications
β’ Serving Size β 1 Veg Capsule
β’ Selenium (elemental) β 200 mcg (from 40 mg L-selenomethionine)
β’ Servings Per Container β 90
β’ Form β Veg Capsules; Yeast-Free
β’ Other Ingredients β Rice Flour; Hypromellose (cellulose) capsule; Microcrystalline Cellulose; Stearic Acid (vegetable source)
β’ Quality β Third-party tested for identity, potency & purity
LifeSource Vitamins β Proudly American β Since 1992
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Selenium 200 mcg (L-selenomethionine) β thyroid & immune support. 3rd-party tested. Clinically Studied Ingredients β NIH/PubMed!*
