2. A person has an injury and can't workout.
Reproductive-age females will benefit the most from iron supplement. During menstrual cycle women get to lose some amount of blood, they need more irons to replace the lost irons because the body uses irons to make extra blood for a woman and her baby too when the woman is pregnant. Iron also helps move oxygen from your lungs to the rest of the body and to the baby. Thus, getting enough iron can prevent conditions of too few red blood cells that can make a woman tired (a condition known as anemia).
Mood swings, weight gain idrk any else
You are doing all the work yourself in individual sports! If you are running the 100 meter dash, nobody is helping you run. It's all on you. Nobody will help you play 18 holes of golf, only you can. You need better physical endurance because you get no help with another person's endurance.
A diet with lots of fruits, vegetables and whole grains to keep the glucose levels steady.