Hysterectomy surgery is sometimes necessary and may result in postoperative fatigue, headache, nausea, depression or pain. In a study reported in the journal Nutrients, researchers from Slovakia’s Comenius University gave 66 women recovering from a hysterectomy either a placebo or 300 milligrams of oak wood extract. Eight weeks later, those given the oak wood extract had lower oxidative stress, better energy and mood, and a greater ability to perform physical tasks and participate in social activities compared to the placebo group, which mostly saw declines in those areas.