Due to malfunction of the hypothalamus-pituitary-ovary axis and probable dysregulation of ovarian activities, ovary has a large number of small follicles but no developed follicles. L-Carnitine is a tiny, water-soluble chemical that plays a critical role in fat metabolism. It is required for appropriate mitochondrial fatty acid oxidation and acyl-CoA ester excretion, as well as affecting ATP levels. The current study was aiming at evaluating the protective effect of L-Carnitine (LC) against deleterious substances present in serum of patients with PCOS, which may affect the oocyte maturation. 60 infertile women diagnosed with polycystic ovarian syndrome have been enrolled in this study and enter their Intracytoplasmic Sperm Injection (ICSI) cycle; they were informed about the study and signed a written informed consent. They were grouped into treatment group (n=30) who were treated with L-Carnitine® tablet for two months and placebo group (n=30). All enrolled women underwent flexible antagonist protocol for ICSI. Significant increase in mean mature metaphase II (MII) oocyte count in study group than placebo group, oocyte maturity rate was significantly higher in study group in comparison with placebo group. In addition, mean fertilized (2PN) oocyte count was increased significantly in study group in comparison with placebo group. Mean fertilization rate was significantly higher in study group in comparison with placebo group. Treatment with of patients with polycystic ovary syndrome of L-Carnitine resulted better oocyte quality and the improvement in oocyte quality is reflected by mature MII oocytes, maturity rate and fertilized rate with eventual improvement in embryo quality.