What is Semen? Semen is made up of sperm, 65 percent of which comes from the seminal vesicles, another 35 comes from the prostate, and the last 5 is from the vasa. What is semen made of? Citric acid, fructose, amino acids, potassium, prostaglandin, enzymes, phosphorylcholine, and zinc. Depending on the individual semen production can […]