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Adolescent girls and young women of childbearing age are the main populations affected by endocrinopathy known as polycystic ovarian syndrome (PCOS). It is especially important to take into account whether clinical and biochemical signs of hyperandrogenism are present in female patients. In maintaining metabolic homeostasis, leptin is crucial. According to research, vitamin D deficiency may play a role in the pathophysiology of PCOS by contributing to insulin resistance, inflammation, dyslipidaemia, and obesity, which are all conditions linked to the syndrome. In this study, leptin and vitamin D3 levels will be measured in order to determine how each relates to the aetiology of PCOS. Materials and Methods: Hundred young women were allocated into two groups, 50 women with PCOS (diagnosed on the basis of revised Rotterdam criteria for PCOS), taken as a study group, and 50 healthy women with no PCOS as control group. Blood samples were collected and tested for hormonal parameters. Results: Between the two groups, there were no appreciable variations in demographic traits. Study groups were found to have considerably higher serum leptin levels than control groups. The study group's vitamin D3 levels were found to be lower than those of the control group. Conclusion: Patients with PCOS are a special population with distinctive hormonal profiles that differ from typical profiles in healthy populations. Comparing PCOS to healthy individuals, leptin levels were higher while vitamin D3 levels were lower. It is necessary to conduct more extensive research on the involvement of leptin and vitamin D3 in the aetiology of PCOS. [ABSTRACT FROM AUTHOR]