The Superstar Thyroid Mineral

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Easy, Vegan and Nut-free Way to Boost Selenium and Reverse Deficiency

200 micrograms of L-Selenomethionine; an optimal daily dose you can count on

Selenium is an essential mineral that is a star player on the Antioxidant A-Team along with Vitamins A, C and E. It strengthens our immune system and has the power to pump up immune cells from scrawny weaklings into deadlifting beefcakes.

Our bodies need selenium in a big way, but many of us are deficient.1 This is because much of the produce today is grown in mineral-depleted soil.2 Plants can only absorb selenium; they don’t actually produce it. We get selenium in our diet by eating plants with selenium or eating animals that ate lots of plants containing selenium. Mineral-depleted soil means selenium-deficient food.

The other challenge is that there aren’t a lot of foods that accumulate much selenium, even if they are grown in selenium-rich soil.3 Brazil nuts offer the highest concentrations (eating two per day can give you a daily dose),4 but we’ve found that it’s surprisingly hard to get your hands on quality nuts. What you typically find in the grocery store is already rancid, which isn’t just a flavor problem, it actually can be harmful.5

Fish such as tuna and halibut are the other big source of selenium, but friends don’t let friends get their daily dose of selenium from fish. If you eat seafood, you are probably aware that it’s wise to limit consumption to minimize exposure to heavy metals such as mercury.6

As with all minerals, selenium is a “Goldilocks nutrient”; you need to get just the right amount. Too little will leave you deficient and too much can become detrimental.7

This is pure selenium with no additional nutrients. It is formulated for maximum bioavailability and easy digestion. Because what’s the point of taking a supplement if your body isn’t able to absorb and use it?

A Daily Dose of an Essential Antioxidant Mineral

Thyroid Regulation

The largest concentrations of selenium are found in the thyroid. If your levels are low, your body can’t make and maintain appropriate levels of the thyroid’s key hormones.10 Some clinical studies have also shown that selenium can reduce the amount of antibodies that target the thyroid in autoimmune thyroiditis such as Hashimoto’s or Graves’ diseases.11,12

Reproductive Health

It appears that selenium plays a role in both men’s and women’s reproductive health. Studies show that it plays a critical role in the health of sperm, which are very susceptible to oxidation.18 Selenium’s antioxidant properties protect the little swimmers. Clinical studies show that higher selenium levels in men correlates with higher quality and motility of sperm.19,20

Strengthen Immune Response

Selenium plays an important function in the regulation of the immune system.13 Studies have shown that selenium helps white blood cells respond to infection, increases the activity of natural killer cells (that’s no pseudonym) and fights viral infections.14,15

Heart Health

Research suggests that selenium’s antioxidant properties may protect the heart from oxidative damage and selenium deficiency has been linked to cardiomyopathy.21 Other studies show that selenium supplementation may help support recovery from cardiac surgery.22

Antioxidant Protection

Selenium increases the body’s levels of glutathione, a “master antioxidant” that combats free radical damage and helps prevent premature aging.16 Our own immune system uses free radicals to fight disease, but they are messy little buggers. The gunk they leave behind leads to inflammation and oxidative stress. Antioxidants gobble up the gunk before it can do harm.17

Mood Enhancement

Research suggests that low levels of selenium may be a risk factor for depression.23 Clinical studies have demonstrated an improvement in the mood of young people when selenium levels were raised to an optimal range and that selenium supplementation can be helpful in improving symptoms of postpartum depression.24,25

The Active Ingredients Inside Selenium

Supplement Facts
Serving Size: 1 Vegan Capsule Servings Per Container: 90
Amount per Serving % DV
(as selenomethionine)
200mcg 364%

† Daily Value (DV) not established

Other Ingredients: Rice Flour, Vegetable Cellulose (capsule)

This product contains no wheat, gluten, GMO, soy, dairy, egg, corn, fish, shellfish, peanuts, tree nuts, barley or added sugar. Proudly vegan, third-party tested, and manufactured in a NSF certified cGMP facility in the USA using worldwide ingredients.

Store in a cool, dry place. Avoid excessive heat. Do not use if safety seal is broken.

Optimal Daily Dose

Unless you live on a Brazil nut farm, it’s hard to get the optimal daily dose of selenium from your diet. Just one capsule a day gives you an easy 200 micrograms.

Nut-free and Vegan

We want our vegan friends and those with nut allergies or sensitivities to get enough of this important nutrient. You need it, friends!

3rd Party Tested and True

Selenium is third-party tested and certified before it ships to ensure you’re getting exactly what the label says.


We are relentless about sourcing the best, most natural, most ethically produced ingredients available. The ingredients in Nested Naturals selenium are 100% non-GMO.

Your Questions, Our Answers

See the most popular questions asked about Selenium.

How is Nested Naturals Selenium different from other forms of Selenium?

Nested Naturals has formulated our dietary selenium for easy digestion and absorption. Not all forms of supplemental selenium are equal. We chose the most bioavailable L-Selenomethionine rather than the selenate and selenite forms.

The Form: L-Selenomethionine
Selenium is an essential mineral that the human body needs, but can be difficult to digest depending upon what it bonds to. When selenium is absorbed from the soil by plants, it bonds to amino acids in the plant. The amino acids help our body absorb the selenium efficiently when we eat our Brazil nuts and other plants that are rich in this mineral.

It’s not feasible to extract from plants sufficient quantities of selenium to create a dietary supplement. As a result, many selenium supplements on the market are produced synthetically in a lab. Some are made from yeast, but lots of people have problems with yeast and we want our supplement to work for everyone.

How many capsules should I take per day?

Take one capsule daily, preferably with a meal.

Should I take this on an empty stomach or with a meal?

We recommend taking it with a meal.

Why is this dose higher than the RDA?

The recommended daily allowance established by the FDA is 55 micrograms and the maximum dose is 400 micrograms. Recent research suggests that the RDA isn’t optimal, especially for folks who are deficient. Each capsule of Nested Naturals Selenium includes 200 micrograms of selenium.

Is Nested Naturals Selenium a synthetic form of selenium?

Supplementary selenium is typically synthetic. It’s not feasible to extract the mineral from plants or other organic material in sufficient quantities to make a dietary supplement.

Is Nested Naturals Selenium non-GMO?

Nested Naturals Selenium is proudly non-GMO, gluten-free, soy-free and made in a NSF certified GMP facility.

Why are there “Other ingredients” listed on the Nested Naturals Selenium label?

We believe that you deserve to know everything that goes into your body. That’s why we include every single ingredient on our label … not just the active ingredients. We are transparent about the “other” ingredients that are necessary to create a working supplement that other labels often don’t bother to mention, such as thickening agents, capsule materials and natural flavoring. These amounts of these ingredients are so tiny that most supplement makers don’t bother listing them.

What is rice flour doing in Nested Naturals Selenium?

Rice flour helps flow the supplement ingredients into the capsule. Tiny amounts are used during the manufacturing process. You’ll find it listed under “Other Ingredients” on our label because we believe that you deserve to know everything that goes into our supplements and your body.

What is vegetable cellulose and what is it doing in Nested Naturals Selenium?

We use vegetable cellulose to make our gel-caps. We’re proud to say that our capsules are vegan and don’t include any animal parts.

What is magnesium stearate and what is it doing in Nested Naturals Selenium?

We use miniscule amounts of magnesium stearate as a flow agent during the manufacturing process. It ensures that the supplement ingredients fill the capsule consistently and properly. We use such a tiny amount that it presents no harm to your health.

What is silicon dioxide and what is it doing in Nested Naturals Selenium?

Silicone dioxide is a compound that is found naturally in many plants, including leafy greens. We use it as an anti-caking agent to prevent the active ingredients in the supplement from clumping together.

Customer Reviews

Discover what real customers say about Selenium.

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LAURA B Verified Buyer 22/05/18
The Selenium is one of the products that I take every day. I am very healthy and eat well daily. I appreciate your products.
Read reviews from our lovely customers


The science behind all of our claims

  • 1. Stoffaneller R, Morse NL. A review of dietary selenium intake and selenium status in europe and the middle east. Nutrients. 2015;7(3):1494-1537.
  • 2. Navarro-Alarcon M, Cabrera-Vique C. Selenium in food and the human body: A review. Sci Total Environ. 2008;400(1):115-141.
  • 3. Edmonds JS, Morita M. The identification of selenium species in biological samples. Applied Organometallic Chemistry. 2000;14(3):133-145.
  • 4. Chang JC, Gutenmann WH, Reid CM, Lisk DJ. Selenium content of brazil nuts from two geographic locations in brazil. Chemosphere. 1995;30(4):801-802.
  • 5. Zajdenwerg C, Branco GF, Alamed J, Decker EA, Castro IA. Correlation between sensory and chemical markers in the evaluation of brazil nut oxidative shelf-life. European Food Research and Technology. 2011;233(1):109-116.
  • 6. Karimi R, Fitzgerald TP, Fisher NS. A quantitative synthesis of mercury in commercial seafood and implications for exposure in the united states. Environ Health Perspect. 2012;120(11):1512-1519.
  • 7. Rayman MP. Selenium and human health. Lancet (London, England). 2012;379(9822):1256-1268.
  • 8. Sors TG, Ellis DR, Salt DE. Selenium uptake, translocation, assimilation and metabolic fate in plants. Photosynthesis Res. 2005;86(3):373-389.
  • 9. Drutel A, Archambeaud F, Caron P. Selenium and the thyroid gland: More good news for clinicians. Clin Endocrinol (Oxf). 2013;78(2):155-164.
  • 10. Lazarus JH. Epidemiology of graves' orbitopathy (GO) and relationship with thyroid disease. Best practice & research.Clinical endocrinology & metabolism. 2012;26(3):273-279.
  • 11. Esposito D, Rotondi M, Accardo G, et al. Influence of short-term selenium supplementation on the natural course of hashimoto’s thyroiditis: Clinical results of a blinded placebo-controlled randomized prospective trial. J Endocrinol Invest. 2017;40(1):83-89.
  • 12. Arthur JR, McKenzie RC, Beckett GJ. Selenium in the immune system. J Nutr. 2003;133(5 Suppl 1):1457S.
  • 13. Kiremidjian-Schumacher L, Roy M, Wishe HI, Cohen MW, Stotzky G. Supplementation with selenium augments the functions of natural killer and lymphokine-activated killer cells. Biol Trace Elem Res. 1996;52(3):227.
  • 14. Yu Yu S, Zhu YJ, Li WG. Protective role of selenium against hepatitis B virus and primary liver cancer in qidong. Biol Trace Elem Res. 1997;56(1):117-124.
  • 15. Tinggi U. Selenium: Its role as antioxidant in human health. Environmental Health and Preventive Medicine. 2008;13(2):102-108.
  • 16. Pisoschi AM, Pop A. The role of antioxidants in the chemistry of oxidative stress: A review. Eur J Med Chem. 2015;97:55-74.
  • 17. Mistry HD, Broughton Pipkin F, Redman CWG, Poston L. Selenium in reproductive health. Obstet Gynecol. 2012;206(1):21.
  • 18. Safarinejad MR, Safarinejad S. Efficacy of selenium and/or N-acetyl-cysteine for improving semen parameters in infertile men: A double-blind, placebo controlled, randomized study. J Urol. 2009;181(2):741-751.
  • 19. Moslemi MK, Tavanbakhsh S. Selenium-vitamin E supplementation in infertile men: Effects on semen parameters and pregnancy rate. International journal of general medicine. 2011;4:99.
  • 20. Benstoem C, Goetzenich A, Kraemer S, et al. Selenium and its supplementation in cardiovascular disease--what do we know? Nutrients. 2015;7(5):3094-3118.
  • 21. Guo F, Monsefi N, Moritz A, Beiras-Fernandez A. Selenium and cardiovascular surgery: An overview. Current drug safety. 2012;7(4):321.
  • 22. Benton D, Cook R. The impact of selenium supplementation on mood. Biol Psychiatry. 1991;29(11):1092-1098.
  • 23. Negro R, Greco G, Mangieri T, Pezzarossa A, Dazzi D, Hassan H. The influence of selenium supplementation on postpartum thyroid status in pregnant women with thyroid peroxidase autoantibodies. The Journal of Clinical Endocrinology & Metabolism. 2007;92(4):1263-1268.
  • 24. Conner TS, Richardson AC, Miller JC. Optimal serum selenium concentrations are associated with lower depressive symptoms and negative mood among young adults. J Nutr. 2015;145(1):59-65.
  • 25. Pieczyńska J, Grajeta H. The role of selenium in human conception and pregnancy. Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS). 2015;29:31-38.