Lessee....... Nitrogen can have a whole series of oxidative states, or valences. Like Chlorine. Nitrates are explosive if finely mixed with reduced chemical species. NO3, is nitrate. HNO3 is nitric acid and N has valence +5. It oxidizes stuff, going to a lower valence and donating ab oxygen atom to whatever it is oxidizing. Nitrous Oxide would be the next in the series, with HNO2 nitrous acid. N valence +3.
So, you sound like a smartass chemistry teacher who is picking a fight or a snickering festival.
I don't know anything. I'm an old fart almost as somnolescent as Biden, that's why I can tell you what he is.
NH3 is ammonia, one of our excretory achievements, along with urea and various other amines where nitrogen has the valence of -3. Amino acids and nucleoside compounds are vital to life as we know it. We actually invest a lot of biochemistry fighting oxidizers most of the way down our biochemical alley, but NO is one short-lived chemical useful in synapse chemistry for very short-term purposes, like the nanosecond impulse crossing a synapse.
Most of life is a fight between oxidation and reduction. A single cell bacteria or a virus is not well-equipped, has no biochemical reserves, to outlast the oxidation, lasting far less than the humancell in a surface lung membrane for example.
It can be said, with practically no caveat at all, that a nitrate in our diet is the source of every nitrogen species in the whole series, potentially. Of course not all nitrate moieties take every possible smal lstep down the slide. Sometimes an energetic bounce takes it more than one step.
So, however you wish to snicker or parse my terminology, just have fun if you must, bjut I have probably forgotten more chemistry than you could find in almost any current textbook.
The nutritional industry does a lot of loose talk with little actual knowledge.