Selenium 200mcg - Powerful Antioxidant Mineral for Immune & Thyroid Support

Selenium is one of the most functionally critical trace minerals in the body — and one of the most commonly deficient, for a reason that has nothing to do with diet.

Selenium content in food is determined almost entirely by the selenium concentration of the soil it was grown in, and large portions of the world’s agricultural land — including significant regions of the United States — are selenium-depleted. You can eat a nutritionally sound diet and still be selenium-insufficient simply because the soil your food was grown in didn’t have enough. The consequences are significant: selenium is required for the production of glutathione peroxidase — one of the body’s most powerful antioxidant enzymes — for the conversion of inactive T4 thyroid hormone into active T3, for immune cell function and proliferation, and for DNA repair. At 200mcg of L-Selenomethionine — the organic, amino acid-bound form with superior absorption and retention over inorganic forms like sodium selenite — this formula provides 364% DV of selenium in the form used in clinical research. 100 veggie capsules — 100-day supply.

Is This You?

• You want comprehensive antioxidant protection and cellular defense against oxidative stress
• You have thyroid concerns — hypothyroidism, Hashimoto’s, or suboptimal T4-to-T3 conversion
• You want to support immune function and white blood cell activity year-round
• You’re focused on DNA protection, repair, and long-term cellular health
• You live in a region with selenium-depleted soil and want to ensure adequate intake
• You’re 40+ building a comprehensive longevity and cellular protection protocol
• You want to pair selenium with iodine for comprehensive thyroid support
• You’re focused on cardiovascular and cognitive antioxidant protection
• You want reproductive health support — selenium plays a role in fertility for both men and women

Benefits You Will Feel

Glutathione Peroxidase & Antioxidant Defense: Selenium’s most fundamental role in the body is as a cofactor for glutathione peroxidase (GPx) — a family of antioxidant enzymes that neutralize hydrogen peroxide and lipid peroxides before they can damage cell membranes, proteins, and DNA. Without adequate selenium, GPx activity declines and oxidative stress accumulates throughout the body. This is the mechanism behind selenium’s broad protective effects — from cardiovascular health to cognitive function to immune resilience. L-Selenomethionine at 200mcg provides the selenium substrate that GPx enzymes require to function at full capacity.

Thyroid Hormone Activation: The thyroid gland contains the highest concentration of selenium of any organ in the body — a reflection of how critically dependent thyroid function is on this mineral. Selenium is required for iodothyronine deiodinase enzymes, which convert inactive T4 (thyroxine) into active T3 (triiodothyronine) — the form of thyroid hormone that cells actually use to regulate metabolism, energy production, body temperature, and cognitive function. Selenium also protects the thyroid gland from the hydrogen peroxide generated during thyroid hormone synthesis — oxidative damage that, without adequate selenium, contributes to thyroid inflammation and autoimmune thyroid disease. For those with hypothyroidism, Hashimoto’s, or suboptimal thyroid function, selenium is one of the most evidence-backed nutritional interventions available.

Immune Function: Selenium supports immune function through multiple mechanisms — it is required for the proliferation and activity of T-cells and NK (natural killer) cells, supports the production of cytokines that coordinate immune response, and protects immune cells from the oxidative stress generated during immune activation. Selenium deficiency is associated with impaired immune response and increased susceptibility to infection. At 200mcg, this formula provides meaningful immune support as part of a comprehensive wellness protocol.

DNA Protection & Repair: Oxidative damage to DNA is a primary driver of cellular aging, mutation accumulation, and long-term health risk. Selenium supports DNA integrity through two mechanisms: directly, via GPx-mediated reduction of the reactive oxygen species that damage DNA, and indirectly, by supporting the thioredoxin reductase system involved in DNA repair. Adequate selenium status is associated with reduced DNA strand breaks and improved genomic stability — making it a foundational component of any longevity-focused supplement protocol.

Cardiovascular & Cognitive Protection: The heart and brain are among the most metabolically active and oxidatively stressed organs in the body. Selenium’s antioxidant protection — via GPx and thioredoxin reductase — extends to endothelial cells lining blood vessels, cardiac muscle cells, and neurons. Adequate selenium supports healthy vascular function, protects against LDL oxidation, and provides neuroprotection against the oxidative stress associated with cognitive aging.

Results Timeline

• Weeks 1–2: Initial improvements in energy and immune resilience; antioxidant enzyme activity begins to increase with consistent selenium intake
• Weeks 4–6: Noticeable enhancement in thyroid function and overall vitality; improved energy and metabolic support
• Weeks 8–12: Significant improvements in antioxidant protection and cellular health; optimal GPx activity supported
• Continued use: Long-term immune health, thyroid support, DNA protection, and antioxidant defense — 100-day supply supports consistent daily use

What's Inside

Serving size: 1 veggie capsule | 100 servings per bottle — 100-day supply

Selenium (as L-Selenomethionine) — 200mcg | 364% DV

Why L-Selenomethionine over sodium selenite? L-Selenomethionine is the organic, food-form of selenium — bound to the amino acid methionine, exactly as selenium occurs naturally in food. It has significantly higher bioavailability and is better retained by the body than inorganic forms (sodium selenite, sodium selenate). It is also the form used in the majority of clinical research on selenium supplementation, including the landmark studies on thyroid health and Hashimoto’s.

Other ingredients: Vegetable cellulose capsule, microcrystalline cellulose · Free from GMO, dairy, soy, wheat, eggs, shellfish · Vegan · GMP-certified USA manufacturing · Third-party tested for purity and potency

How to Take

Take 1 capsule daily with a meal. Take consistently at the same time each day for best results. Do not exceed the recommended dose — the tolerable upper intake level for selenium is 400mcg daily from all sources combined.

Pro tip: Selenium and iodine work synergistically for thyroid health — iodine provides the building blocks for thyroid hormones, while selenium activates them and protects the thyroid from oxidative damage. Pairs well with our Potassium with Iodine formula for comprehensive thyroid support. Also works synergistically with Vitamin E as part of a comprehensive antioxidant protocol. For personalized guidance, contact us at 412-347-2478 to speak with a practitioner.

Quality & Safety

Third-party tested for purity and potency · L-Selenomethionine (superior bioavailability over inorganic forms) · GMP-certified USA manufacturing · Vegan veggie capsules · Non-GMO · Free from dairy, soy, wheat, eggs, and shellfish · Gluten-free.

• Thyroid conditions (hypothyroidism, Hashimoto’s, Graves’ disease): Consult your healthcare provider before use — selenium affects thyroid hormone metabolism and may affect medication dosing
• Thyroid medications (levothyroxine, Synthroid): Consult your healthcare provider — selenium may affect T4-to-T3 conversion and dosing requirements
• Chemotherapy drugs: May interact — consult your oncologist before use
• Immunosuppressants: May affect immune function — consult your healthcare provider
• Statins: May interact — consult your healthcare provider
• Dosage warning: Do not exceed 400mcg daily from all sources combined — our 200mcg dose is safe and well within the established upper limit
• Pregnancy & nursing: Consult your healthcare provider before use
• Children under 18: Consult your healthcare provider for appropriate dosing

Frequently Asked Questions

What does selenium do for the body? Selenium is an essential trace mineral required for the production of glutathione peroxidase — one of the body’s most powerful antioxidant enzymes — which protects cells from oxidative damage. It is also essential for converting inactive T4 thyroid hormone into active T3, supporting immune cell function, DNA repair, and reproductive health. Despite its importance, selenium deficiency is common, particularly in regions with selenium-depleted soil.

Why is L-Selenomethionine better than sodium selenite? L-Selenomethionine is the organic, food-form of selenium bound to the amino acid methionine. It has significantly higher bioavailability, is better retained by the body, and is the form used in most clinical research. Sodium selenite is an inorganic form with lower absorption and retention.

Is selenium good for thyroid health? Yes — selenium is one of the most important minerals for thyroid function. The thyroid gland has the highest concentration of selenium of any organ in the body. Selenium is required for the enzymes that convert T4 into active T3, and it protects the thyroid from oxidative damage caused by hydrogen peroxide produced during thyroid hormone synthesis.

Is selenium beneficial for Hashimoto’s thyroiditis? Multiple clinical studies have shown that selenium supplementation (typically 200mcg daily of L-Selenomethionine) can significantly reduce thyroid peroxidase antibodies (TPO antibodies) — the key marker of Hashimoto’s — and improve thyroid function and quality of life. If you have Hashimoto’s or another thyroid condition, consult your healthcare provider before supplementing.

Is selenium safe to take with iodine? Yes — and they work synergistically. Iodine provides the building blocks for thyroid hormones; selenium activates those hormones and protects the thyroid from oxidative stress. Many practitioners recommend taking both together for comprehensive thyroid support.

Can I take too much selenium? Yes. While selenium is essential, excessive intake above 400mcg daily long-term can cause selenosis, with symptoms including hair loss, nail brittleness, nausea, and fatigue. Our 200mcg dose is safe and effective for daily use and well within the established safe upper limit. Do not combine with other selenium-containing supplements without monitoring your total daily intake.

Can selenium help with fertility? Yes. Selenium plays an important role in reproductive health for both men and women — in men, it is essential for sperm motility and protecting sperm from oxidative damage; in women, it supports healthy thyroid function which is critical for fertility and pregnancy outcomes.

This formula provides medically recognized selenium to support healthy antioxidant activity, thyroid function, and immune balance. Selenium plays a documented role in supporting cellular protection, metabolic regulation, and the conversion of thyroid hormones needed for daily energy and physiological stability. Its antioxidant properties assist with maintaining normal immune response and reducing oxidative stress. This supplement may be used to support individuals experiencing nutrient depletion, increased oxidative demand, or heightened physiological stress related to daily activity.

60-Day Money-Back Guarantee

Try it risk-free! We’re confident you’ll experience enhanced antioxidant protection, improved thyroid function, better immune health, and comprehensive cellular support. If you’re not completely satisfied within 60 days, simply contact us for a full refund — no questions asked. Your health and satisfaction are our top priorities.

The Wellness Store Difference

At The Wellness Store, we’re committed to providing premium mineral supplements that deliver real results. Our Selenium 200mcg uses L-Selenomethionine for superior absorption — tested for purity and potency. We stand behind every product with our satisfaction guarantee because your cellular health and overall wellness are our priorities.

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. Consult your healthcare provider before use, especially if you have thyroid disorders, are pregnant or nursing, or take thyroid medications, chemotherapy, immunosuppressants, or statins. Do not exceed the recommended dose.