To respond your question about NAC (N-acetyl-L-cysteine), I've seen small evidence suggesting that is effective for tinnitus. Instead - however the research is limited - various historical studies explain success with the herb ginkgo biloba. Try taking two tablets of standardized extract of ginkgo 3 times a day with meals (just about a total dose of 240 mg daily).
Ginkgo may work by increasing blood circulation to the head and neck. Give it a minimum of a two-month trial. You might also explore cranial therapy, a gentle manipulative method performed by osteopathic doctors. This approach seems to take the pressure off the auditory nerves. If high blood pressure is liable for your ears ringing, try to get that under control through diet, exercise, and weight-loss or medication if necessary.
Going to a concert and rocking out can be an exciting experience. However if you hear muffled ringing in your ears, a phenomenon known as tinnitus, after the concert, it is usually a sign that you got so close to the speakers. This ringing happens when the loud noise damages the very fine hair tissues that line your ear.
Longer exposure to sounds above 80 decibels (dB) leads to hearing problems. Concerts are usually around 115 dB or even more, depending where you're standing. The louder the sound volume, the less time it takes for noise-induced hearing loss to happen.
The ringing you hear may be constant or sporadic. It may also seem as other sounds like whistling, buzzing, or roaring. In most cases, tinnitus from concerts will resolve itself within a couple of days.