What is selenium good for: it is a trace element that the body cannot make and gets from food. Selenium contributes to the normal thyroid function. Selenium contributes to the normal function of the immune system. Selenium contributes to the protection of cells from oxidative stress. How much a day: the EU nutrient reference value (NRV) is 55 µg (0.055 mg), and the EFSA tolerable upper intake level for adults is 255 µg a day from all sources. Stivits sells selenium as a separate vegan tablet: 100 µg in the form of L-selenomethionine, 182% NRV. Adults take 1 tablet a day with food, and 180 tablets last 180 days. A varied and balanced diet and a healthy lifestyle are important.
Selenium is in 12 Stivits products, and the dose in the daily serving differs 25-fold: from 4 to 100 µg. So before you buy, look not only at the name but also at the number of µg and at what you already take.
| Stivits product, daily serving | Selenium | % NRV (55 µg) | % of upper level (255 µg) | Lasts |
|---|---|---|---|---|
| Selenium as L-selenomethionine 100 mcg, 1 tablet | 100 µg | 182% | 39% | 180 days |
| Men's Fertility Formula, 1 capsule | 60 µg | 109% | 24% | 60 days |
| Mega Men Premium, 1 tablet | 50 µg | 91% | 20% | 60 days |
| Men's Premium Complex, 1 tablet | 50 µg | 91% | 20% | 120 days |
| Women's Vits Premium, 1 tablet | 50 µg | 91% | 20% | 90 days |
| Pregnancy Plus, 1 tablet | 50 µg | 91% | 20% | 90 days |
| Hair Formula With Biotin 2500 mcg, 1 tablet | 50 µg | 91% | 20% | 90 days |
| Prostate Formula, 1 capsule | 50 µg | 91% | 20% | 90 days |
| Blood Sugar Level Control, 1 tablet | 50 µg | 91% | 20% | 60 days |
| Multivitamins and Minerals, 1 tablet | 30 µg | 55% | 12% | 90 days |
| Pau D'Arco+Vitamin C+Selenium, 1 tablet | 30 µg | 55% | 12% | 120 days |
| Skin, Hair & Nails Formula, 1 tablet | 4 µg | 7% | 2% | 90 days |
The separate 100 µg tablet suits you if you need only selenium and want a clear dose without other ingredients. Downside: on its own it gives 39% of the upper level, so add it to a combination product with selenium only after you have added up the total. A combination product suits you if you want selenium together with vitamins and minerals. Downside: you cannot change the selenium dose in it, and you have to count its other ingredients together with those in your other food supplements.
The EU register has six authorised claims about selenium. They apply if the daily serving holds at least 8.25 µg of selenium, which is 15% NRV. The Stivits tablet holds 100 µg, so the condition is met at 1 tablet a day.
A varied and balanced diet and a healthy lifestyle are important.
In the body, selenium is part of selenoproteins. In humans, 25 genes for such proteins have been found. Among them are five glutathione peroxidases, which are antioxidant enzymes, and three deiodinases, which take part in the metabolism of thyroid hormones.
L-selenomethionine is an organic form of selenium, close in structure to the amino acid methionine. Sodium selenite is an inorganic salt. Six forms of selenium are authorised in food supplements in the EU. The form is named on the pack for two Stivits products: L-selenomethionine in the 100 µg tablet and sodium selenite in Mega Men Premium, 50 µg per tablet. For the other products with selenium, the form is not named in the composition.
| Form of selenium | Type | What is known about it |
|---|---|---|
| L-selenomethionine | Organic | Almost 90% of the selenium in common plants is in this form. It can be built into proteins in place of methionine |
| Selenium-enriched yeast | Yeast enriched with selenium | Authorised in EU food supplements |
| Sodium selenite | Inorganic salt | Authorised in EU food supplements |
| Sodium hydrogen selenite | Inorganic salt | Authorised in EU food supplements |
| Sodium selenate | Inorganic salt | Authorised in EU food supplements. In water, selenium is mostly in the form of selenate |
| Selenious acid | Inorganic | Authorised in EU food supplements |
Stivits does not promise anything about absorption and does not rank the forms on that basis. We name the form and the dose. The downside of any form is the same: the EFSA upper level of 255 µg a day covers all six.
For adults in the EU the NRV is 55 µg a day, and EFSA gives the adequate intake as 70 µg. Selenium is measured in micrograms: 100 µg is 0.1 mg. The upper level of 255 µg counts all sources together: food, tablet and combination products.
| Indicator, selenium per day | Value |
|---|---|
| NRV, EU reference value | 55 µg |
| EFSA adequate intake, adults | 70 µg |
| EFSA adequate intake, breastfeeding | 85 µg |
| TAI recommendation, Estonia | 75–90 µg |
| Average from food, upper bound across adult groups aged 18–64 | 65.6 µg |
| EFSA upper level, adults | 255 µg |
| 1 Stivits tablet | 100 µg |
The average figures come from six European surveys, and Latvia is among the countries in the EFSA assessment. If food brings 65.6 µg, the Stivits tablet brings the total to 165.6 µg, which is 65% of the upper level. Even with 113 µg from food, the upper bound of the 95th percentile for men, the total of 213 µg stays below 255 µg.
The picture changes if you combine products. The 100 µg tablet, Men's Fertility Formula with 60 µg and Prostate Formula with 50 µg give 210 µg a day. Add 65.6 µg from food and the total is 275.6 µg, above the upper level.
According to EFSA, half of the selenium food supplements on the EU market give 50 µg a day or more, 15% give 70 µg or more, and the maximum is 220 µg. The Stivits 100 µg tablet is among these 15%.
Selenium contributes to the normal thyroid function. For this claim, 8.25 µg of selenium in the daily serving is enough, and the Stivits tablet holds 100 µg.
Iodine is usually discussed alongside selenium. Iodine contributes to the normal production of thyroid hormones and normal thyroid function. Both ingredients are in Multivitamins and Minerals from Stivits: 100 µg of iodine and 30 µg of selenium in 1 tablet, and the pack lasts 90 days. A varied and balanced diet and a healthy lifestyle are important.
If you take medicines, are under a doctor's care, are pregnant or breastfeeding, consult a doctor before use and show them the composition. A food supplement is no substitute for medical advice.
The richest source of selenium is Brazil nuts, followed by offal, seafood and meat. The amount depends strongly on the soil in which the plants and the animal feed were grown. So the figures below show the order of magnitude, not an exact dose.
| Food, serving | Selenium |
|---|---|
| Brazil nuts, 5–6 nuts | 100–2000 µg |
| Tuna, 85 g | 91.8 µg |
| Halibut, 85 g | 47.1 µg |
| Prawns, 85 g | 42.1 µg |
| Salmon, 85 g | 30.2 µg |
| Beef, 85 g | 28.9 µg |
| Wholegrain bread, 2 slices | 16.4 µg |
| Milk, 240 ml | 7.6 µg |
The row for nuts is from EFSA, and the other figures are US food data. In Estonia the Health Development Institute (TAI) gives this guide: 75–90 µg are found in about 25 g of boiled kidneys, 70 g of stewed liver, 80 g of boiled crayfish or 110 g of sunflower seeds.
Adults: 1 tablet a day with food. The instructions do not set a time of day, so choose a meal that you do not skip. Do not exceed the recommended daily dose. Store in the original packaging in a dry place at room temperature. Keep out of the reach of young children. Food supplements should not be used as a substitute for a varied and balanced diet.
Selenium has a narrow safety margin: the upper level is only 4.6 times the NRV. Signs of long-term excess, according to EFSA: brittle, thickened nails with white spots, brittle hair and hair loss, and a garlic smell on the breath. So more is not better here.
The Stivits tablet is meant for adults. EFSA advises caution with selenium food supplements for toddlers and children.
Selenium contributes to the normal thyroid function. Selenium contributes to the normal function of the immune system. Selenium contributes to the protection of cells from oxidative stress. The Stivits tablet holds 100 µg of selenium, and adults take 1 tablet a day with food. A varied and balanced diet and a healthy lifestyle are important.
Selenium is measured in micrograms: 100 µg is 0.1 mg. The NRV is 55 µg, and the EFSA tolerable upper intake level for adults is 255 µg (0.255 mg) a day from all sources, food included. The Stivits tablet gives 100 µg, which is 39% of this level and 182% NRV. Do not exceed the serving of 1 tablet a day, and count the selenium in other food supplements.
L-selenomethionine is an organic form, close to the amino acid methionine. Almost 90% of the selenium in common plants is in this form. Sodium selenite is an inorganic salt. The form is named on the pack for two Stivits products: L-selenomethionine in the 100 µg tablet and sodium selenite in Mega Men Premium, 50 µg per tablet.
Stivits does not promise anything about absorption and does not rank the forms on that basis. We name the form and the dose: the Stivits tablet holds 100 µg of selenium in the form of L-selenomethionine. The EFSA upper level of 255 µg a day is the same for all six forms authorised in EU food supplements.
With food. Adults take 1 Stivits tablet of 100 µg a day, and 180 tablets last 180 days. The instructions do not set a time of day, so choose a meal that you do not skip.
The Stivits instructions do not set the length of a course: 1 tablet of 100 µg a day, and 180 tablets last 180 days. The limit is not the duration but the total: 255 µg a day from all sources. If you take selenium for longer or with other food supplements, add up the doses.
Selenium contributes to normal spermatogenesis, which is a claim of the EU register. The Stivits tablet holds 100 µg of selenium, and adults take 1 tablet a day. Men's Fertility Formula from Stivits has 60 µg of selenium and 20 mg of zinc in 1 capsule. A varied and balanced diet and a healthy lifestyle are important.
Yes, if the total of each ingredient stays below its EFSA upper level: 255 µg for selenium, 25 mg for zinc a day from all sources. The Stivits zinc tablet holds 25 mg, which is already that level, and selenium at 100 µg gives 39% of its own. The instructions do not set a time of day, and both tablets are taken with food. If you want both ingredients in one capsule, Men's Fertility Formula from Stivits has 60 µg of selenium and 20 mg of zinc.
Yes. Stivits selenium in the form of L-selenomethionine comes in vegan tablets: 100 µg in 1 tablet, 180 tablets in the pack.
If you take medicines, are under a doctor's care, are pregnant or breastfeeding, consult a doctor before use and show them the composition: 100 µg of selenium in the Stivits tablet.
Stivits is a brand of the Estonian company HYPERPHARM OÜ (Tallinn). The supplements are made in Europe, in the EU, in a factory certified to GMP, HACCP and ISO 22000:2018. Stivits sells direct from the factory, with no wholesalers or pharmacies in between.
Stivits sells direct from the factory, with no wholesalers or pharmacies in between. ISO 22000:2018 and GMP confirm the production. We dispatch your order by the next working day. The Stivits shop is rated 4.9 out of 5 on Judge.me, based on 944 reviews. Data updated 6 November 2026.
The composition and doses of the products are taken from the Stivits catalogue, data as of 6 November 2026.