We used an essential oil protocol for retraining and got our sense of smell back within weeks, and I'd have to say that mine is better than it was before.

On a side note, my dad (80) lost his smell about 15 years ago. He's an avid coffee drinker. The other day he told me that he'd been using an oil that i had told him restores nerve function 2 or 3 times daily for a couple months, and that he smelled the coffee brewing that morning for the first time.

If you'd like the protocol that we used, let me know.