In the human body, redox reactions (redox reactions), the essence of which is the transfer of electrons between the molecules of various substances, occur continuously. These processes are the basis of all vital activity of any organism. That is, in itself, redox reactions are not only not harmful, but are necessary for any person. However, in some cases redox reactions have a side effect - the formation of free-radical compounds. If the reaction leaves a substance with one or more unpaired electrons on its outer electron shell, it becomes overactive and unstable. For its neutralisation, free radicals must react with another molecule and oxidise it. Often this process leads to the death of a healthy cell of the body, whose molecule will be destroyed by the free radical in the process of oxidation. Proteins, fats, nucleic acids and other elements necessary for a person can be affected.
If a person has a poor diet, sleep problems, is under stress for a long time, often smokes or drinks alcohol, the probability of free radical formation increases several times. Together, their action leads to lower immunity, accelerated ageing, and an increased risk of cancerous tumours and cardiovascular diseases.