What is the logic of it? Seems like it's a drug that you'd take because you are taking another drug or have a disease because you are not breathing correctly?

I've been spending a lot of time lately at high altitude, walking up and down steep slopes, and I've got so used to pushing hard that I've slightly strained all my walking muscles. I figured out that I was allergic to something in eggs, after getting a mild case of biliary colic, and realised that there might be a connection to an itchy rash I got that seemed to be triggered by eggs plus sunlight.

As soon as I stopped the eggs, I decided to try increasing the milk intake and though I'm almost overdoing the exercise, I'm bulking up fast, never seen my calf muscles so chunky in my life.

As far as nitric oxide goes, don't you just need to focus on breathing in through your nose? Have you tried physiological sighs?