Hematogen is a taste familiar from childhood. It was invented in Switzerland in the 19th century to combat anemia - iron deficiency. Iron is contained in Hematogen in the form of hemoglobin - a protein of red blood cells. It is produced from the blood of cattle. Its real benefit for anemia is small, in order to obtain a therapeutic effect, you need to eat it in 10 bars. And in itself, Hematogen is a relic of the past, which was previously used for no other means. At the moment, Hematogen is banned in Europe (this is due to the production of gobies from whole blood and epidemiological danger). I would put the question differently: why in the XXI century we can still buy Hematogen in a pharmacy? Especially when there are really high quality, effective and inexpensive iron supplements.
So that your liver does not fall off from excess iron.
This is one of the strangest questions I've seen here. Obviously, such things should be used in certain dosages.