This is a very expensive ingredient and it is just a few supplements that actually use it. It not only helps Increase Semen Production but also helps boost the secretion of nitric oxide which plays pivotal role in helping you get hard and firm erections. This is an amino acid that not only increases the production of testosterone but also stimulates growth hormone. L-arginine also helps increase sperm count. Moreover, it also encourages the production of nitric oxide and ensures rock solid erections.