Effects of Antioxidant Supplementation of Culture Media on IVF Embryos

The goal of this clinical trial is to investigate the impact of repeated antioxidant supplementation on blastocyst utilization and expansion rates in embryos under different oxygen concentrations. The study aims to answer the following main questions: * Does adding antioxidants every 12 hours to embryo culture media improve usable and expanded blastocyst utilization rates on days 5 and 6? * How are the O2 concentrations related to the effect of different methods of antioxidants supplementation on blastocysts utilization and expansion rates? Participants in this study are infertile couples undergoing in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI) cycles. * Zygotes will be incubated at either 5% or 20% oxygen tension until the blastocyst stage. * Sibling zygotes will be divided into four groups: Group 1A and 1B: Antioxidants every 12 hours at either 5% or 20% O2 tension, respectively. Group 2A and 2B: Antioxidants only once at the beginning of embryo culture at either 5% or 20% O2 tension, respectively. Researchers will compare the four groups to determine if the repeated antioxidant supplementation of the culture media leads to improved blastocyst utilization and expansion rates compared to the baseline group.