leilam, I'm very interested in how many respond to your question. My doctor had given me a "recipe" for 7% but I'm holding off trying it. What if it is, at some point contaminated and you breath some bacterium directly into your lung. We have enough of a problem already without adding to it.

It is extremely difficult to find in my area. I called a huge number of Walgreens and found some way north of me. Luckily they fedexed it to me. I had been buying from a supplier but he did not answer my last email. It was costly. Walgreens takes goodrx and was lots cheaper. I would advise looking up walgreens on google maps and trying same state but further away in both directions.