Can Periods Be Delayed Intentionally? Yes, they can. The most commonly used medications are progesterone based hormones, such as: Norethisterone Medroxyprogesterone acetate These are usually started 35 days before the expected date The effects of N acetylcysteine on ovulation and sex hormones profile in women with polycystic ovary syndrome: a systematic review and meta analysis British Journal of Nutrition Cambridge Core Many women suffering from irregular menstrual cycles due to PCOS have testified to Glutathione helping them regularize their cycle, bringing it back to its normal rhythm. Do you have a Late again? An Open Label Case Series of Glutathione Use for Symptomatic Management in Children with Autism Spectrum Disorder