Certain supplements can help increase seminal fluid production. These include zinc, selenium, and L-carnitine. Zinc helps to regulate hormone levels which can improve sperm count and motility. Selenium is an antioxidant that helps protect sperm from damage due to oxidative stress. Lastly, L-carnitine has been shown to increase semen volume as well as improve sperm motility and quality. All of these supplements should be taken in conjunction with a healthy diet and regular exercise for optimal results.