His scientific work focuses in particular on the role of testosterone in metabolic health, cardiovascular disease, diabetes, sexual function and men's quality of life. A special focus is on the diagnosis and treatment of hypogonadism (testosterone deficiency) and on the long-term effects of testosterone replacement therapy. His research has contributed significantly to expanding the understanding of the link between hormonal health and chronic diseases.

Prof. Saad is the author and co-author of over a hundred scientific publications and is one of the world's most published researchers in the field of testosterone and men's health. As an internationally sought-after speaker, he regularly contributes his expertise to scientific conferences and specialist events, thus making a significant contribution to the further development of evidence-based medicine in andrology.