Has anyone found a relive for Tinnitus ringing ears?
No.
But taking NAC (N-Acetyl Cysteine) prior to exposure to noise does help prevent damage. You can get this at any drug store.
http://www.google.com/search?q=nac+hearing+loss
Of course that's far from a substitute for wearing ear protection. Good earmuffs combined with
properly inserted plugs are the way to go.
AOSafety Nitro urethane plugs have a NRR of 32 dB, and can be bought in bulk at any hardware store. These are the highest-rated off-the-shelf plugs available.
When I take someone shooting I have them use these in combination with AOSafety Shotgunner/Stow-A-Way. At NRR 21 dB these are not the most effective muffs on the market, but I can carry three sets in my range bag and that's important to me.
For myself, I had been using plugs in combination with Peltor Tactical 6S electronic muffs (NRR 19 dB), but after a recent Appleseed shoot (~14,000 rounds fired over 16 hours) I decided that wasn't enough and have since upgraded to Peltor Tactical Pro muffs (NRR 26 dB).
There were folks at that Appleseed using only ear plugs, and mostly not using them properly. I felt very sorry for them.