14 Reasons for a Late or Missed Period (Besides Pregnancy) 9 Obvious Reasons for Missed Periods or Late Periods Glutathione is such a critical soldier in our line of defense that our bodies make it themselves. We even have mechanisms that recycle and reuse it. But what happens when our toxic 9 Obvious Reasons for Missed Periods or Late Periods A fin loop like structure in GPX4 underlies neuroprotection from ferroptosis: Cell