LifeSource Vitamins Selenium 200 mcg — 90 Veg Capsules — 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 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 (with research)
• Supports Thyroid Autoimmunity — RCTs show L-selenomethionine (200 μg/day) can reduce thyroid peroxidase antibodies (TPOAb) and improve markers in autoimmune thyroiditis.
de Farias, 2015 — PubMed;
Mantovani, 2019 — PubMed;
Kyrgios, 2019 — PubMed
• Boosts Immune Cell Activity — Double-blind RCT (200 μg/day) enhanced lymphocyte proliferation and natural killer cell activity in adults.
Kiremidjian-Schumacher, 1994 — PubMed
• Improves Sperm Motility (Men with Low Selenium) — Randomized placebo-controlled trial reported improved motility and higher conception rate in subfertile men.
Scott, 1998 — PubMed
Additional Studies Showing Promising Benefits*
• Thyroid Context (Evidence Syntheses) — Systematic reviews/meta-analyses summarize RCTs on selenium and autoimmune thyroiditis.
Huwiler, 2024 — PubMed;
van Zuuren, 2013 — PMC
• Male Fertility (Combination Trials) — Selenium with vitamin E (± folate) improved semen parameters in idiopathic infertility (multi-nutrient RCTs).
Moslemi, 2011 — PMC;
Bahmyari, 2021 — PubMed
Global Evidence & Authoritative Reviews*
• Evidence overviews on selenium, selenoproteins and thyroid/immune roles.
Ventura, 2017 — PMC
We monitor research from the world’s leading institutions — including Harvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge University, Oxford, Stanford, Yale, MIT, the University of Florida, Oregon State University – Linus Pauling Institute, Tufts, Boston University, Cornell, Columbia, and Ohio State — to ensure our guidance remains aligned with the highest standards of credible science.*
Brief Benefit Bullets
• Supports thyroid antibody balance in autoimmune thyroiditis*
• Helps maintain healthy immune cell activity*
• 3rd-party lab tested for identity, potency & purity
Perfect For
• Adults seeking thyroid and immune support with a yeast-free selenium*
• Men looking to support healthy sperm motility (with clinician guidance)*
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
• Serving Size — 1 Veg Capsule
• Selenium (elemental) — 200 mcg (from 40 mg L-selenomethionine)
• Servings Per Container — 90
• Form — Veg Capsules; Yeast-Free
• Other Ingredients — Rice Flour; Hypromellose (cellulose) capsule; Microcrystalline Cellulose; Stearic Acid (vegetable source)
• Quality — Third-party tested for identity, potency & purity
Key Ingredients
L-Selenomethionine (organic selenium) — The primary dietary form of selenium used in many RCTs evaluating thyroid autoantibodies and immune function.*
LifeSource Vitamins — Proudly American — 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. Always consult your physician before taking any supplements.
Selenium 200 mcg (L-selenomethionine) — thyroid & immune support. Clinically Studied Ingredients — NIH/PubMed!*
