Selenium (as Selenomethionine)

Selenium is an essential trace mineral found in Brazil nuts, seafood, and whole grains that protects cells from oxidative stress and supports thyroid hormone conversion, making it a foundational micronutrient for normal hormone levels and immune function in women 35+. In element3 Rise (AM Formula), selenium is provided as selenomethionine at 60mcg (0.06mg), the full recommended dietary intake, to support thyroid function, cellular defence, and immune health.

Selenium (as Selenomethionine)

Technical review: Lucy Yang, MFoodTech (Dist.)Reviewed

[ 01 ] Key Facts

Dose in element3 element3 Rise: 60mcg (0.06mg)
Form Selenomethionine (0.5%) — organic, amino acid-bound form with superior bioavailability
Signs you may need more Persistent fatigue, thinning hair, frequent illness, sluggish thyroid symptoms
Safe range 55–70mcg daily for adult women; upper intake level 400mcg/day.

Food sources

  • Brazil nuts
  • Yellowfin tuna
  • Sardines
  • Eggs

[ 02 ] Rationale

Why this ingredient is in element3

Selenium’s most important role in the body is one most women have never heard of: it is essential for the conversion of inactive thyroid hormone (T4) into its active form (T3). This conversion is catalysed by selenoprotein enzymes called deiodinases, and without adequate selenium, this conversion is less efficient. It’s one of the reasons selenium status matters for normal thyroid function.

Beyond thyroid function, selenium is a core component of glutathione peroxidase, one of the body’s most powerful endogenous antioxidant systems. Glutathione peroxidase neutralises hydrogen peroxide and lipid peroxides before they can damage cell membranes, DNA, and mitochondria. This antioxidant function is part of the body’s everyday antioxidant defence.

The selenomethionine form used in element3 Rise is the organic, amino acid-bound form of selenium that the body absorbs and retains more efficiently than inorganic forms like sodium selenite. Selenomethionine is incorporated directly into body proteins, creating a selenium reserve that the body can draw upon as needed. This makes it the preferred form for supplementation.

Within the element3 Rise formula, selenium works synergistically with several key ingredients. Vitamin E and selenium are co-dependent antioxidants — selenium recycles glutathione peroxidase while Vitamin E protects cell membranes, and each spares the other from depletion. Vitamin D3 supports the immune system that selenium helps regulate. And Zinc (in the element3 Rest formula) complements selenium’s thyroid and hormonal support, with the protocol’s AM/PM separation ensuring both minerals are absorbed without competition.

At 60mcg, element3 Rise provides the full RDI in a form that addresses a genuine nutritional gap, particularly for women living in New Zealand, where selenium-poor soils mean dietary intake is often insufficient.

[ 03 ] Formulator's Notes

From the formulator

Selenium matters here in particular: New Zealand soils are low in it, so many of us fall short. It's critical for thyroid health and for healthy skin and nails.
Lucy YangLucy Yang · Principal Food Technologist, element³

[ 04 ] At 35+

Relevant at 35+

Thyroid function is worth attention after 35, and selenium sits at the centre of it. During perimenopause, shifting oestrogen levels affect how thyroid hormone moves through the body, and selenium supports the conversion step that keeps that process running normally.

Sustained stress also draws on the body’s antioxidant reserves, including the glutathione peroxidase system that depends on selenium. Keeping selenium intake steady is a simple way to hold that baseline.

This is why selenium sits in element3 Rise. At 60mcg it provides the full RDI as selenomethionine, the form the body absorbs and retains most efficiently, addressing a gap that New Zealand’s selenium-poor soils make genuinely common.

[ 05 ] Your Questions

Your Questions

What is selenium?
Selenium is an essential trace mineral that the body cannot produce and must obtain through diet or supplementation. It functions primarily as a component of selenoproteins, a family of over 25 proteins involved in antioxidant defence, thyroid hormone metabolism, DNA synthesis, and immune function. Selenium is incorporated into these proteins as selenocysteine, a unique amino acid, making it structurally unlike other minerals. New Zealand soils are notably low in selenium, which means dietary intake is frequently insufficient for many New Zealanders.

What are the benefits of taking selenium?
Selenium supplementation supports thyroid health by enabling the conversion of inactive T4 thyroid hormone to the active T3 form, immune function through its role in selenoprotein-based antioxidant defence, and protection of cells from oxidative damage. Research also links selenium status to normal hormone levels and to skin and hair health. For women in New Zealand, where soil selenium is chronically low, supplementation is one of the most reliable ways to ensure adequate status.

What are the benefits of selenium in the element3 protocol?
In element3 Rise, selenium at 60mcg in selenomethionine form supports the hormonal and antioxidant foundations of the formula. It works synergistically with Vitamins D3 and E to support normal thyroid function and hormone levels, three nutrients that each influence different aspects of endocrine function. Selenium’s antioxidant role via glutathione peroxidase also complements the cellular protection provided by Enzogenol® NZ Pine Bark and Trans-Resveratrol, adding a different antioxidant mechanism to the element3 Rise protective stack.

What is the recommended daily intake of selenium?
The recommended dietary intake for adult women is 55–70mcg per day. element3 Rise provides 60mcg — meeting the RDI in a highly bioavailable selenomethionine form. The upper safe intake level is 400mcg per day; selenium has a relatively narrow safe range compared to other minerals, so supplementation above the upper limit should only be undertaken under medical supervision. In New Zealand, where soil and food selenium levels are low, meeting the RDI through diet alone is genuinely difficult.

What food provides selenium?
Brazil nuts are the most concentrated food source of selenium, with a single nut providing 70–100mcg — though levels vary significantly by soil origin. Other sources include yellowfin tuna, sardines, eggs, chicken, sunflower seeds, and whole grains. However, in New Zealand and parts of Australia where soils are selenium-depleted, even these foods may contain lower selenium than international food tables suggest. This is one reason selenium is included in element3 Rise rather than relying on dietary sources alone.

Are they any selenium side effects?
At the 60mcg dose in element3 Rise, selenium is safe and well-tolerated. Selenium toxicity (selenosis) only occurs at sustained intakes well above the 400mcg upper limit, and manifests as brittle hair and nails, garlic breath, fatigue, and in severe cases neurological symptoms. The selenomethionine form in element3 Rise is the safest and most bioavailable form of selenium. There is no risk of toxicity at the RDI dose, and the organic selenomethionine form is less likely to accumulate than inorganic selenium salts.

What are selenium deficiency symptoms?
Selenium deficiency symptoms include persistent fatigue, hair thinning or loss, frequent illness and poor immune resilience, reduced thyroid support, muscle weakness, and poor nail quality. In regions with selenium-depleted soils like New Zealand, subclinical deficiency is common without being obvious, many women experience the downstream effects of low selenium status without connecting them to this trace mineral.

What form of selenium is in the element³ blend?
element3 Rise uses selenomethionine (0.5%), the organic, amino acid-bound form of selenium. This is the form naturally found in selenium-rich foods and the form with the highest bioavailability of all selenium compounds. Selenomethionine is absorbed through the same transport mechanism as methionine (an amino acid), achieving absorption rates of 90% or above compared to approximately 50–60% for inorganic selenium salts. It is also the form best supported by clinical research for thyroid and antioxidant health outcomes.

[ 06 ] The Research

1 study

The Research

Study Key finding
Effect of selenium supplementation on musculoskeletal health in older women: a randomised, double-blind, placebo-controlled trialWalsh, J. S., Jacques, R. M., Schomburg, L., Hill, T. R., Mathers, J. C., Williams, G. R., & Eastell, R. (2021). Effect of selenium supplementation on musculoskeletal health in older women: A randomised, double-blind, placebo-controlled trial. Lancet Healthy Longevity, 2(4), e212–e221. https://doi.org/10.1016/S2666-7568(21)00051-9
Six months of selenium supplementation significantly improved selenoprotein status in older women, with neutral effects on bone turnover.
 Read →

[ 07 ] In the Protocol

Where Selenium (as Selenomethionine) sits in the element3 Protocol

In element3 Rise (AM Formula), selenium at 60mcg as selenomethionine supports normal thyroid function and the body’s antioxidant systems. It works alongside Vitamin E and Vitamin D3, and complements the Zinc in element3 Rest, with the AM/PM split keeping both minerals absorbed without competition. For women in New Zealand, where soil selenium is naturally low, a consistent daily intake addresses a genuine dietary gap.

You can learn more about the full element3 ingredient philosophy at element3.co.nz.

Good to know

This page is for general education only. It is not medical advice and is not a substitute for advice from your doctor, pharmacist or other health professional. Dietary supplements should not replace a balanced diet. Always read the label and use only as directed. If symptoms persist, or you are pregnant, breastfeeding or taking medication, talk to your health professional before use.