Selenium

Name: Selenium
Brand: Thorne
SKU: product-0242
Price: 15.00 GBP
Availability: InStock
Rating: 4.9 (41 reviews)

£15.00

Supports T4-to-T3 thyroid hormone conversion
May help reduce thyroid peroxidase antibody levels
Contributes to antioxidant defence via selenoproteins
Suits those with low dietary selenium intake
Supports normal immune cell function

4.9 (41 reflections)

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about this product.

Thorne Selenium is a single-ingredient supplement delivering selenium in the form of selenomethionine, an organically bound amino acid chelate that is generally considered well absorbed compared to inorganic selenium salts. Selenium is an essential trace mineral that the body cannot synthesise on its own. It is incorporated into selenoproteins, a family of enzymes that include glutathione peroxidases — key players in the body's antioxidant defence — and iodothyronine deiodinases, which convert the thyroid prohormone T4 into the active form T3. These mechanisms explain why selenium is routinely discussed in the context of thyroid health, particularly in conditions such as Hashimoto's thyroiditis and Graves' disease, where it is studied for its potential to modulate thyroid peroxidase antibody levels. Beyond thyroid function, adequate selenium status is linked to normal immune cell activity and to the protection of cells from oxidative stress. Selenium intake from food varies considerably with geography, and soils in parts of Europe — including the UK — tend to be low in selenium, making dietary shortfall more common than is often appreciated. This supplement suits those with confirmed or suspected low selenium status, individuals managing thyroid conditions under medical supervision, and anyone whose diet is light in selenium-rich foods such as Brazil nuts, seafood, or organ meats. Thorne is a brand with a long-standing reputation for formulation rigour and clean excipient profiles, which is why it features across several of our nutrition protocols.

frequently asked.

Who is most likely to benefit from a selenium supplement?

People with confirmed low selenium status via blood test, those managing autoimmune thyroid conditions under medical care, and individuals whose diets are low in selenium-rich foods — such as those eating little seafood or nuts — are the most relevant candidates. UK soil is notably selenium-poor, so dietary intake is often lower here than in North America.

How does selenomethionine differ from other forms of selenium?

Selenomethionine is selenium bound to the amino acid methionine, which is how selenium occurs naturally in plant foods. It is generally considered to have good bioavailability compared to inorganic forms such as sodium selenite or selenate, and it is the form most frequently used in clinical research on thyroid health.

Is it safe to take selenium long-term?

Selenium has a narrower gap between adequate intake and excess than most minerals, so long-term use at higher doses carries a risk of selenosis. At a standard daily dose this risk is low, but it is worth checking your level via a blood test before supplementing and reviewing periodically with your GP or clinician, particularly if you also eat Brazil nuts regularly.

Can I take this alongside my thyroid medication?

Selenium supplements are generally considered compatible with thyroid medications such as levothyroxine, but you should always inform your prescribing doctor before adding any supplement to your routine, especially when managing an active thyroid condition.

How long before I might notice a difference?

Selenium works at a cellular and enzymatic level, so changes are unlikely to be felt acutely. In clinical studies on thyroid autoimmunity, measurable effects on antibody levels are typically assessed over several months. Regular monitoring via blood tests is the most reliable way to track progress.

Customer reflections

Overall sentiment

4.941 reflections

1 – 6 of 41 reflections

QQVerified Buyer

The first adrenal support that made a quick difference.

4 days ago

Gentle on a sensitive stomach, and I feel like myself again. I had tried two other glandulars before this and neither sat right.

MRVerified Buyer

Steadier mornings within a fortnight.

1 week ago

I was sceptical about glandulars, but my mid-afternoon crash has genuinely eased. One capsule with breakfast and I forget about it.

ALVerified Buyer

Subtle, but real.

2 weeks ago

Not a stimulant, which is exactly what I wanted. It took about ten days, then I realised I wasn’t dreading the afternoon any more.

SKVerified Buyer

My clinician recommended it.

3 weeks ago

Bought after a blood panel flagged a flat cortisol curve. Easy to take, no jitters, and the sourcing is refreshingly transparent.

TPVerified Buyer

Recovery feels faster.

1 month ago

Training hard through a stressful stretch and this has helped me bounce back between sessions. Already on my second bottle.

DVVerified Buyer

Does what it says.

1 month ago

No frills, one ingredient, a sensible dose. I appreciate that it is designed to be used for a season rather than forever.

Selenium

about this product.

how to take it

frequently asked.

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