Selenium Complex Ultra 200µg

Bioactive + Depot

High-dose, bioactive selenium complex with 200µg selenium per tablet. Made from over 20 natural forms of selenium from mustard seeds and inactive selenium yeast as well as sodium selenite. Pressed tablets made from pure acacia fibre, no additives. Highly bioavailable and slow release. 365 tablets
  • Wide range of forms: over 20 natural selenium forms
  • High-dose with 200µg elemental selenium per tablets
  • One year supply, 365 tablets
  • Selenium from mustard seeds, selenium yeast (non-active yeast), as well as highly active sodium selenite
  • Selenium supports immune system, hair, nails, thyroid function and protection of cells against oxidative stress
  • With selenium forms from highly purified water extract of mustard seeds, inactive nutritional yeast, sodium selenite
  • With fibre-rich acacia fibre from sustainable, pesticide-free cultivation 



Delivery : 1–3 business days

Incl. VAT, excl. Shipping

€207.73 / 1kg
In stock

Premium Bioactive Ingredients

  • Bioactive complex, high-dose with 200µg elemental selenium per tablet
  • Of which 100µg highly bioactive sodium selenite
  • Of which 50 µg from selenium yeast with a high proportion of selenomethionine
  • Of which 50 µg from various vegetable forms of selenium from mustard seed
  • With selenium as a highly pure water extract of mustard seeds
  • Chemically organic selenium derived from nutritional yeast (Saccharomyces cerevisiae)
  • Sodium selenite in pharmaceutical quality from Germany
  • With fibre-rich acacia fibre from sustainable, pesticide-free cultivation 

How are we different?

Selenium supplements with individual compounds often involve a trade-off between immediate availability and extended retention. Our selenium complex offers the best of both worlds, combining a diverse range of forms (from mustard seeds), organic selenium methionine (from selenium yeast), the most common form found in foods, and sodium selenite.

Half of the selenium in this complex is 100% natural, purely plant-derived selenium from mustard seeds and selenium yeast. These natural sources of selenium are complex themselves, containing over 20 different organic selenium compounds and other valuable nutrients and plant substances. Among these is the highly beneficial directly bioactive seleniumocysteine.

Our tablets contain only one additional ingredient: premium acacia fiber grown without pesticides. Unlike the usual synthetic filler microcrystalline cellulose with added nanoparticles, we use natural, fibre-rich acacia fibre as a filler. Our acacia fibre comes from climate-neutral, sustainably resource-conscious, and fair cultivation practices.


  • Premium active ingredients in their purest form
  • Sourced directly from the world’s best producers
  • Our select raw materials are the basis of all our formulations
  • Complete avoidance of all unnecessary additives and adjuvants
  • Exclusive use of valuable natural ingredients for additives
  • We voluntarily declare all ingredients
  • All extractions performed without the use of chemical solvents
  • Custom production when necessary, in order to achieve the highest possible level of purity
  • Independent laboratory testing available on product pages
  • Raw materials sourced only from premium suppliers who are committed to fair working conditions
  • Amber glass and compostable pouches used for packaging
  • Vegan capsule shells, free from PEG and carrageenans
  • Packaged in the EU according to HACCP, GMP and ISO 22000:2018 standards
  • Stored in non-toxic containers
  • Shipped in mineral oil-free boxes
  • All products guaranteed 100% free from magnesium stearate, silicon dioxide, nanoparticles (no legal opportunism), genetic engineering, artificial colours and flavours, titanium dioxide and added sugar & sweeteners



Selenium is a vital essential trace element and an integral part of more than 25 enzymes. It plays a role in several important bodily functions: protecting cells from peroxides and other radicals, reactivating other antioxidants such as vitamin C and coenzyme Q10, regulating and maintaining the immune system, activating the thyroid hormone thyroxin, preventing inflammation, promoting fertility, and contributing to detoxification. Selenium also plays a role in protecting cells from oxidative damage by free radicals and maintaining healthy functioning of the thyroid gland. It also promotes healthy hair and nail growth.

Mustard Seed Extract

100% chemically organic selenium derived purely from mustard seeds. Mustard seeds are naturally rich in numerous organic selenium compounds. Obtained via a water extraction process with no chemical solvents or residues.

Sodium Selenite

Sodium selenite has a slightly lower absorption rate than organic selenium, but very high bioactivity. The selenium is directly and exclusively available for the formation of selenium enzymes and is not built into other proteins without enzyme activity. Furthermore, sodium selenite is subject to strict regulation of selenium metabolism, such that excessive selenium will be excreted and not accumulated in the body. Because of its direct effects on selenium proteins, sodium selenite is a central component of many treatments for severe selenium deficiencies. Our sodium selenite is an ultra pure ingredient in pharmaceutical quality from Germany.

Selenium Yeast

Selenium yeast contains more than 20 different organic selenium compounds. The majority (more than 60%) exist as L-selenomethionine, the most important source of selenium for humans. The rest is composed of different forms of selenium including highly bioactive selenocysteine.

Recent studies suggest that selenium yeast has a high concentration of a wide range of important proteins, some of which play have a supplementary role to selenium. This may explain the results of many studies that show selenium yeast has a better effect on important biological markers than isolated selenomethionine.

Selenium yeast is a completely inactive yeast which cannot multiply. It is an extremely beneficial food source and should not be confused with baker's yeast or intestinal yeast such as Candida.

According to the EFSA, selenium positively contributes to:

  • The protect of cells against oxidative stress
  • The functioning of the immune system
  • Thyroid functioning
  • Sperm formation (semen cell formation)
  • Hair and nail growth


Recommended Dosage

Take 1 tablet (200µg selenium) daily with 200ml water.

Daily Requirements

To avoid developing a deficiency, the official daily requirement for selenium according to the German Nutrition Society (DGE) corresponds to 30µg-70µg (NRV: 55µg).


Do not take sodium selenite at the same time as reducing agents such as vitamin C, as the latter will render the selenium ineffective (intake interval of at least 1 hour).
Due to its depot properties, selenomethionine can accumulate in the body. Closely monitor selenium blood levels during long term high dosages of this product. Selenomethionine can reduce histamine levels.

Food Supplement

Do not exceed the recommended dose. Food supplements cannot replace a balanced and varied diet. Keep out of reach of children.


Store in a cool, dry place away from direct sunlight and heat.



Acacia Fibre, Selenium Yeast, Calcium Carbonate, Sodium Selenite, Mustard Seed Extract.
Contains: 365 tablets

Ingredients per Daily Dose (1 Tablet) % NRV*
Selenium  200µg 364
   of which sodium selenite 100µg 182
   of which mustard seed extract 50µg 91
   of which selenium yeast 50µg 91

* Nutrient Reference Value

Per Capsule: 200µg Selenium

In total: 73.000µg Selenium/ jar

Product Details

German Pharmaceutical Number (PZN): 16130130
Origin Selenium from mustard seed extract (water-based extraction process), selenium yeast from the EU, sodium selenite from Germany
Production Bottling and pressing in the EU according to HACCP, GMP / ISO 22000:2018 standards Finished products packaged in amber glass jars, and stored in non-toxic containers Shipping in mineral oil-free boxes
Tablets Pressed with sustainably cultivated acacia fibre, produced without pesticides or additives
Packaging Amber glass jar to protect against light and oxidation (free from plasticisers and BPA)
To reuse Remove product label by soaking the jar in warm water for 5 minutes. Glue residue can be removed with dish soap.

Sunday Natural

Our Philosophy

For thousands of years, cultures all over the world have been using medicinal plants and nutritious foods to naturally foster and maintain vitality and good health.

With our products, we try to emulate this ancient wisdom as much as possible.

Consequently, our philosophy is simple: everything we do meets the highest standards of quality and purity; our focus is on organic and natural ingredients.

We follow this philosophy with meticulous care on all levels and down to every last detail.

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