No. Not true.
Selenium is a mineral that we need for life, but in microscopic quantities. Within 50 ppm of a gram per day.
Selenium is found in soil and water. Some living creature gradually accumulates it from there, and then we must eat this living creature. We get selenium from meat, fish, seeds and grains.
Selenium is part of some proteins in our body and participates in a bunch of different processes: it helps the thyroid gland, heart, and immunity work.
With a lack of selenium in children, bones may indeed form incorrectly, but this is not associated with calcium.
Sometimes there is very little or a lot of selenium in some area. Both oddities are found in China.
If you stubbornly avoid foods that contain selenium, then you can die.
Selenium can be poisoned. If we exclude the Chinese who ate some of their Chinese plant foods with selenium, then lovers of biologically active food additives are most often poisoned.
Imagine a very small amount of this selenium in some selenium supplement. How will the supplement manufacturer measure this business there? Few people will bother and would rather pour you this selenium into a pill from a barrel. Approximately.
Therefore, selenium supplements contain almost a thousand times more than we need per day.
In fact, all of these selenium supplements are almost never harmless vitamins. They look more like a hard drug from a hospital. Selenium has too little range between normal daily intake and poisoning.
On the other hand, selenium sulfide is found in a bunch of different anti-dandruff shampoos. Selenium so cleverly suppresses keratinization in the skin that the scalp flakes less from it.
Or else in agriculture it is going to be used for product enrichment. Almost spraying from planes. That is, in some places selenium literally flows like a river.
Briefly speaking
Eat meat, seafood, seeds, and grains. This is an already normal part of the diet. It is very difficult to get insufficient selenium. But they can be poisoned. Don't look for selenium supplements. Demand creates supply. They will be sold to you, and you will be poisoned by them.
