I find this interesting.
I've had tinnitus for 25+ years. I've tried every herb, vitamin, and drug you can get to improve my tinnitus. Almost 90% of all that stuff I tried did nothing or made it worse. The cause of one's tinnitus can have different mechanisms for sure. For me, my tinnitus is most definitely from hearing loss. In the beginning, I thought it all started from using Advil for a bad tooth; it's still a suspect. Working in an environment with so much noise didn't help either. I would be okay with just hearing loss, but the high-pitched ringing can drive the best of us crazy. I learned to live with it and tune it out, just not think about it and don't stress if possible.
A common thing I see here is meds to correct a problem; at least for men, it's often for high blood pressure. The high blood pressure meds often cause erectile dysfunction, and then you get meds for that as well. This process keeps going until you get high cholesterol, triglycerides, diabetes, a fatty liver, heartburn, edema, poor circulation, etc. I only have my theories as to why all that happens and NO2 is a starting point.
Lately, I've been drinking 4 to 8 oz of Beet Juice with Lemon juice per day. I don't want to take much more than that amount because I'm on medications. It's only been a few weeks, and my Blood pressure has dropped, near perfect readings of 120/80 mmHg. I have also lost 25 pounds in the last year. Maybe if this keeps going, I can get off some of my meds. Also, my cholesterol and triglycerides look good. I came here after noticing my tinnitus has been lower; I still have hearing loss, though. I just got in from mowing the lawn that raises my tinnitus, and it's less bad.
I wouldn't say NO2 will make tinnitus worse or better, but I guess it all depends on the mechanisms of your tinnitus. The NO2 vasodilatory effect that increases oxygen delivery to the organs, I think, could raise the tinnitus volume, but is that only a temporary effect, and would your mind adjust? As they say, sometimes things get worse before they get better. The oxidative stress and inflammation caused by poor diets may cause cochlear damage. I've tried many flavonoids and antioxidants, and those made my tinnitus much worse. These days, I try to stick to the more natural things for my nutritional needs; supplements are not requirements. I've paid enough in supplements to put kids through college. Nothing like paying for super expensive methylated multivitamins; get your DNA Methylation Screening, and eat real healthy food, is my advice.
Also, make a note of the "Beetroot > Potassium up > Tinnitus up." I've taken a lot of Potassium in both supplements and food sources. I have never noticed Potassium to be a cause for my tinnitus levels. Beetroots are high in folic acid, which may help with hearing. Nitrates cause vasodilation, which in turn may drop blood pressure. Thus, the ringing in your ears could be caused by the sudden drop in your blood pressure. I can see here that the original post sounds like this was for a workout stack, probably for better pumps and stamina. All of that in itself opens a mystery box of supplements, stimulates, and other anabolic and metabolic increases with lord only knows what all sorts of effects they have on the body and mind while you are stressing the body out during a workout.
For me right now, I will keep drinking the Beets and Lemons, forget about the tinnitus stress, and let my mind return to a resting place. If my tinnitus gets worse and I pin it down on NO2, I'll come back and say it, if nothing else, at least to help someone else or maybe just myself.