And one excellent manner in the direction of this purpose is the day by day use of a top-drawer penis fitness oil (health specialists recommend Man Man Oil , which is clinically proven slight and safe for skin). The most reputable oils are likely to include both L-arginine and L-carnitine. The former is an amino acid that enables the body produce nitric oxide, thereby more easily allowing penile blood vessels to enlarge as wished. L-carnitine is a neuroprotective aspect that can assist keep wanted penis sensation, even when the penis is subjected to extremely hard use.