Yes, that is what I am talking about. The E-string is a ring like used for BC pills. You get 2mg of estrogen over a 3 month period, locally in that area. It's such a low dose that it actually takes almost the whole three months to feel the benefit at first, although I noticed improvement after a couple of weeks. Of course, that's not saying that some doesn't get into your system, but the dose is so low that it is even prescribed for people who have had cancer. I was still having hot flashes when I got it and it certainly wasn't enough estrogen to stop those! I like it because you just put it in and leave it for 3 months and then get a new one.
Not only did it improve my sex life, but also cycling. I was at the point where I could barely sit on the saddle and the saddle wasn't the problem. When I went for my annual exam, my doctor was shocked that I lesions! She couldn't figure out why, until I told her right away, I knew they were from cycling with my thin membranes. She had never seen this before. Now she's a tri-athlete, so she's much more aware of this stuff.
I would not take HRT for this, but this has been a good alternative for me.