Selenium

Selenium products often contain several times the EU NRV in a single tablet. This guide helps you compare the actual dose, selenium form and whether a high-strength product makes sense in context.

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In this guideIngredient basics, choosing & product comparison

What is selenium?

Selenium is an essential trace mineral. It occurs naturally in foods including fish, eggs, meat and Brazil nuts, while the selenium content of plant foods can vary according to the soil in which they are grown. Because the required amounts are small, supplement labels usually use micrograms (µg), not milligrams.

What does selenium support?

Selenium contributes to normal thyroid and immune-system function, the maintenance of normal hair and nails, and protection of cells from oxidative stress. It also contributes to normal sperm formation.

What happens if you don’t get enough selenium?

Selenium deficiency on its own rarely causes obvious illness. In very low-selenium regions it has been associated with specific conditions such as Keshan disease, a form of cardiomyopathy, and deficiency can also worsen the effects of iodine deficiency on thyroid function.

Deficiency is uncommon — and excess matters too

Selenium needs are small, and high habitual intakes can cause selenosis. Hair and nail changes can occur with excessive selenium as well as being marketed as reasons to take it, so symptoms alone are not a good basis for choosing a high-dose supplement.

L-selenomethionine, selenium yeast or inorganic selenium?

L-selenomethionine is an organic selenium-containing amino acid and is widely used in supplements. Selenium-enriched yeast contains selenium incorporated into yeast compounds, commonly including selenomethionine. Inorganic forms such as sodium selenite are chemically different. Form is useful comparison information, but it should not become an unsupported “best form” badge.

How much selenium should you compare?

The EU nutrient reference value is 55 µg. This is useful for label comparison but is not a personal prescription. Products commonly provide 50, 100 or 200 µg, so the daily serving can vary from around the NRV to several times it.

Compare selenium dose and form →

Selenium in thyroid, hair and nail formulas

Selenium is often combined with iodine in thyroid-focused products and with zinc or biotin in hair and nail formulas. These categories fit selenium’s authorised EU claims for normal thyroid function and maintenance of normal hair and nails. A longer ingredient list is not automatically better.

What should you compare?

Selenium per day

Use the recommended daily serving, not just the amount per tablet.

Selenium form

For example L-selenomethionine, selenium yeast or another declared form.

Other active ingredients

Selenium often appears with zinc, iodine, vitamins or antioxidant combinations. Count selenium from overlapping products.

Format and vegan suitability

Tablets and plant capsules can be vegan, but verify the complete formulation rather than assuming from the selenium source.

Health information: More selenium is not automatically better. Consider selenium from food and other supplements, and seek professional advice if supplementation is being used for a diagnosed thyroid, fertility or other medical condition.

Product comparison

Compare selenium supplements

Compare selenium per day, serving, selenium per unit, selenium form, other active ingredients, format and vegan suitability.

More is not automatically better. The EU Nutrient Reference Value (NRV) for selenium is 55 µg for adult labelling, while EFSA's adult Tolerable Upper Intake Level (UL) is 255 µg/day from all sources. The NRV is a labelling reference, not a personal dose recommendation. Compare the recommended daily dose and remember selenium from other supplements and food.

Product	Selenium / day	Recommended serving	Selenium / unit	Selenium form	Other active ingredients	Format	Vegan
Solgar Selenium 100 µgView product ↗	100–200 µg	1–2 tablets daily, preferably at mealtimes	100 µg	L-selenomethionine	—	Tablet	Yes
Solgar Selenium 200 µgView product ↗	200 µg	1 tablet daily, preferably with a meal	200 µg	L-selenomethionine	—	Tablet	Yes
Pharma Nord Bio-Selenium + ZincView product ↗	100 µg	1 tablet daily	100 µg	SelenoPrecise® selenium yeast	Zinc 15 mg; vitamin C 90 mg; vitamin E 15 mg; vitamin B6 2 mg	Tablet	No – gelatin ingredient listed
NOW Foods Selenium 200 µgView product ↗	200 µg	1 capsule daily with a meal	200 µg	L-selenomethionine	—	Veg capsule	Yes
Viridian Selenium 200 µgView product ↗	200 µg	1 capsule daily with food	200 µg	L-selenomethionine	—	Plant-cellulose capsule	Yes

EU health claim details

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Authorised health claims

A quick consumer view — full regulatory list available below

● Selenium contributes to the normal function of the immune system.Immune system · General population

Claim type
Health functions (Article 13)

Condition of use
The claim may be used only for food which is at least a source of selenium.

What does “source of” usually mean?
General food: 8.25 µg / 100 g or 100 ml
Beverage: 4.125 µg / 100 ml
Single-portion pack: 8.25 µg per portion
Calculated from the EU NRV significant-amount reference. Claim-specific conditions take precedence.