Stay well hydrated
Eat a balanced diet with enough calories and protein
Include zinc-rich foods such as meat, shellfish, beans, and nuts
Include selenium-rich foods such as Brazil nuts, eggs, and fish
Include folate-rich foods such as leafy greens, beans, and citrus
Get regular exercise
Maintain a healthy body weight
Sleep 7 to 9 hours per night
Reduce stress
Avoid smoking
Limit alcohol use
Avoid recreational drugs
Avoid heat exposure to the testicles
Avoid tight underwear if it causes overheating
Ejaculate less frequently if you want temporarily larger volume
Review medications with a doctor if semen volume is low
See a doctor if the change is sudden or persistent