Any idea what your nitric oxide (NO) levels are? Probably not. A lot of people haven't even heard of NO! Turns out, guys, this compound can play a pretty big role in your sex life. Here's what's true, and what's not, about nitric oxide and erectile dysfunction (ED).

Myth: The cause of my ED is (a) I'm old; (b) my partner's a turnoff; (c) I'm on meds.

Reality: Maybe…or maybe the cause is low nitric oxide. When you ask the average person, even men, what causes erectile dysfunction, a low nitric oxide level isn't likely to be mentioned. That's because the condition isn't well known to the public, despite the fact it is considered the primary mediator of penile erection. Nitric oxide is