Prof. Jerzy Popinigis' significant contributions to the scientific development of multiple generations of researchers are undeniable, and his work and discoveries have had a profound impact on various fields of study, including biology, medicine, sports, and nutrition. Prof. Popinigis researched free radicals and their effects on living organisms throughout his life. His pioneering approach to this subject and innovative research methods have revolutionised our understanding of biochemical processes and associated diseases.