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Doctor's Assessment Included

Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.

Minerals

Selenium

Selenium is a key antioxidant that helps combat exercise-induced oxidative stress. It also supports thyroid function for optimal metabolic rate during training.

What It Measures

This test measures the level of selenium in your blood. It reflects your dietary intake and selenium status, which is important for various selenoprotein functions.

Why It Matters

Selenium supports thyroid hormone metabolism, immune function, and protects cells from oxidative damage. Both deficiency and excess can affect health. Consult your healthcare provider for personalised advice.

When to Test

Testing may be recommended if you have thyroid disorders, live in a selenium-poor region, or have a restricted diet. It may also be relevant for those concerned about antioxidant status.

Symptoms

Low Levels

Symptoms of selenium deficiency may include fatigue, weakened immunity, thyroid dysfunction, muscle weakness, and cognitive decline. Severe deficiency can affect heart health.

High Levels

Excess selenium may cause garlic breath, hair loss, brittle nails, nausea, and neurological symptoms. Toxicity is usually from over-supplementation. Consult your healthcare provider.

Lifestyle Tips

Brazil nuts are one of the richest sources of selenium — just 1-2 nuts per day may provide adequate intake. Other sources include seafood, eggs, and whole grains. Avoid excessive supplementation.

Frequently Asked Questions

How much selenium do I need daily?
Daily requirements are small. Your healthcare provider can advise on the right amount based on your individual needs. Excessive intake should be avoided.
Can selenium support thyroid health?
Yes, selenium is essential for converting thyroid hormones and may support thyroid function. It is often considered alongside iodine when evaluating thyroid health.
Are Brazil nuts really that high in selenium?
Yes, Brazil nuts are exceptionally rich in selenium. Just one or two per day can provide more than the daily recommended amount, making them both a convenient source and a risk for overconsumption.