Selenium · Atomic number 34 · Intake in micrograms

Selenium in the formation of sperm cells

The European Commission has authorized two wordings for this trace element. Kernitbogen sets out which enzymes lie behind them and how far the permitted wording extends.

To the fundamentals

Three panels

Quote, quote, figures

The three panels below separate what is quoted as a matter of law from what is merely described. Only the first two contain a wording registered in the Union Register; the third lists quantities only.

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GPx4 in the midpiece of the sperm cell

During maturation, a firm protein sheath forms around the mitochondria of the midpiece. Its main component is phospholipid hydroperoxide glutathione peroxidase, or GPx4 for short — a selenium-containing enzyme that, in this phase, largely relinquishes its catalytic activity and becomes structural material. The process is described in cell biology; the only permissible claim is the sentence below.

Selenium contributes to normal spermatogenesis In accordance with Regulation (EU) No 432/2012
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The hair follicle as a division-active tissue

A follicle passes through phases of growth, regression and rest. During the growth phase, the cells of the hair matrix divide as often as in almost any other tissue, and protein turnover there is correspondingly high — including selenium-containing proteins. The authorized sentence speaks of maintenance, not of length, density or color.

Selenium contributes to the maintenance of normal hair In accordance with Regulation (EU) No 432/2012
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Reference intake, levels and their variation

For nutrition labeling, the European Union states 55 micrograms of selenium per day as the reference intake. How much a single food provides depends on the growing region: the same variety of wheat grown in two fields can carry levels that differ several-fold. Table values therefore reflect orders of magnitude, not a property of a specific pack.

Quantities per labeling law. They carry no health claim and therefore appear without a quoted register sentence.

The path of the element

How selenium reaches tissue in the first place

Between the selenium in a food and the selenium in a finished body protein lie several stations. They can be described one by one — and that description is something other than a health claim. The distinction shapes the structure of this page.

Absorption in the small intestine and the detour through the liver

In foods, selenium is predominantly present in organically bound form, in plant sources mainly as selenomethionine. This form enters the intestinal cell via the same transport routes as the corresponding sulfur-containing amino acid; published balance studies report high absorption rates for it. Inorganic compounds such as selenite follow different routes and are accounted for differently.

A large part of the absorbed selenium first reaches the liver. There it is not simply stored, but built into a protein that is then released into the blood as a transport form. Only via this detour does the element reach other tissues.

Transport to the germ tissue

This transport form is called selenoprotein P and carries several selenium atoms per molecule. Tissues with high demand retrieve it from the blood via receptors of the lipoprotein receptor family; for testicular tissue, ApoER2 is described as such a receptor. Animal studies show that the supply to this tissue persists even when intake remains scarce over a longer period.

This observation comes from basic research and is not itself an authorized claim. It explains a possible mechanism — nothing more. What is quotable appears solely in the two marked blocks of this page.

Between description and authorized wording

Regulation (EU) No 432/2012 lists several entries for selenium. Kernitbogen takes up two of them. Both belong to the same element but refer to separate processes and may neither be shortened nor merged into a single statement:

Selenium contributes to normal spermatogenesis In accordance with Regulation (EU) No 432/2012
Selenium contributes to the maintenance of normal hair In accordance with Regulation (EU) No 432/2012

Both sentences are addressed to the general population and presuppose a sufficient intake. The remaining text on this page lies outside claims law: it describes bodily processes and food levels. It says nothing about diseases, dosages or individual products.

Kernitbogen Fundamentals as a PDF file

The detailed text follows the path of the trace element further, from the soil sample to the cell. It includes level tables with an origin note, the derivation of the reference intake and the tolerable upper level, a glossary, and a Q&A section on the two register entries.

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The withdrawal period

Even for a digital edition, the statutory right of withdrawal of 14 days remains in place. A short email is enough; Kernitbogen does not require a specific form. Refunds are made via the same payment method through which the amount was received. Start of the period, exceptions and the template are set out under Withdrawal Policy.

Health notice

The claims quoted here come from European Union food law. They refer to healthy people with sufficient intake and say nothing about diseases, their prevention or their course. Anyone who notices symptoms should have them clarified at a medical practice; anyone considering a supplement should discuss the amount and the compound form there as well. Kernitbogen does not state an intake amount for the individual case.

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