"I, and two people I know, use helichrysum (the italicum variety) from Corsica for our tinnitus. It doesn't STOP the T, but it can reduce the intensity for SOME people. (Like all things related to T, nothing works for everyone. I've known one or two people who say it didn't help them at all--though they didn't buy it where I buy it, so I'm not sure what quality theirs was.) I've done some research on the chemical in the helichrysum plant (neryl acetate--also tannin, which is wine, which is probably why red wine helps some people's T) and there is some evidence that this chemical can help with inflammation (including inflamed nerves) and nerve damage. Not sure if that's why it helps with some people's T or not. You have to buy therapeutic grade oil and it has to be the italicum variety because that has the highest amount of neryl acetate in it.
I've tried using it (always undiluted) around the ear cup, along the jawline, on reflexology points on my feet, in a few drops put in a capsule and swallowed, inhaled, rubbed on either side of my spine on the back of my neck, and rubbed it under my nose so I smell it as I sleep at night--and all combinations of these! What I found works best for me is on either side of my spine on the back of my neck (I'm told because that's where the nerves go up into your brain stem/brain, but IDK), inhaling it (several deep breaths of the bottle from each nostril and hold it in for about 5 seconds each time), and then a dab under my nose. I do this before bed each night.
I find when I do this I have more low-volume T days than when I don't. (Don't get me wrong--I still have some loud T days--just not as many as when I don't use the helichrysum.) I used to be able to wake up with bad T and do this routine again in the a.m. and my T would sometimes go down a bit. Sadly, that doesn't happen anymore, perhaps because I take more medication now than I used to. (It was a huge disappointment to find out that didn't work for my anymore, let me tell you!)
Unfortunately, helichrysum is one of the most expensive EOs out there because the plant is relatively rare. I've purchased it online in an olive-oil sized bottle from Europe (Corsica), but then it has to go through customs, and the shipping is like $25. I did a lot of digging and found a reputable U.S. seller online I buy from now. It's actually more expensive than buying from Europe, but the shipping is cheaper (free because I buy the bottle that costs enough to give me free shipping) and I don't have to worry about customs or a European company not sending me what I've paid for! So I bite the bullet and pay the higher price in the U.S., though where I get it is still cheaper than the popular EO companies out there now.
Of course, the bigger bottle you buy, the cheaper it is per ounce, so once I knew it worked for me I stopped buying the tiny bottles and now buy the biggest one I can afford which lasts me about 9 months, sometimes longer."