The polar bodies will be transferred to the UHN microarray center for chromosome number determination. The analysis will be done with a commercial kit from Advalytix ( Olympus Life Science Research, Munich, Germany). This is a multiplex PCR based kit that provides a fast and accurate count of all 23 chromosomes and is tailored to polar body chromosome count. After 2 days a single embryo with a normal karyotype will be transferred to the uterine cavity under ultrasound guidance using a Cook transfer catheter (Cook, Sidney, Australia). The rest of the viable embryos with a normal karyotype will be frozen (Slow freezing). Luteal support will consist of progesterone suppositories 100mg (Kingsway Pharmacy,Toronto, Ontario Canada) vaginally 3 times a day starting on the day of transfer and will continue for 2 weeks until the end of each cycle when serum beta hCG will be drawn and if pregnant, CoQ10/ placebo will be discontinued. If pregnant, luteal support will continue until 10 weeks gestation. If the patient is not pregnant she will have a cycle of endometrial stimulation with micronized estradiol, followed by progesterone once a sufficient endometrial thickness has been measured. Four days afterwards, 1-2 embryos will be thawed and transferred. Luteal support will include estradiol and progesterone which will be maintained up to 10 weeks if pregnant. These cycles of frozen embryo transfer will be continued as long as there are frozen embryos from the same retrieval.