1. The iron deficiency anemia.

A decrease in the level of iron leads to a decrease in the production of hemoglobin. Iron helps deliver oxygen to all body cells. With a deficiency of this mineral, daytime sleepiness appears in a person. Iron deficiency can occur at any age. It appears due to the fact that the body uses more iron than comes with food. Deficiency of this element can be determined using a special blood test.

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1. Glycine.

This amino acid helps improve mental performance and concentration. Taking glycine is especially necessary during times of stress and if you cannot concentrate. During stress, it improves the functioning of neurons and activates cellular respiration. It is not necessary to take glycine supplements; there are foods that contain it. Quail eggs, pumpkin seeds, ginger, peanuts, walnuts and pine nuts, sesame, marmalade, pistachios, basil, soybeans are especially rich in glycine.

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