Copper is important for keeping iron levels proper, which helps prevent anemia. Anemia increases fatigue and exhaustion and can sometimes help people pass out getting up too fast.
In my 20s as a female, I was usually anemic. My doctor prescribed iron. Did not do much good. Early thirties read that Vitamins E and C would be good for my varicose veins issue that was developing. The bad veins went away and the anemia went away. Book said with deficiency red blood cells might just live 85 days, with the Vitamin E for 115 days. Now 50 years later I still take those 2 vitamins and a lot of other supplements. Health and strength good for my age.