Stillwantmore, I usually just lurk here but I had some info on testosterone levels before and after about 12 weeks of wearing the ROP. Since I may be one of the few that have actually tested my testosterone levels, I thought I would weigh in. First, let me tell you that I am 48 yrs. old and felt that I was experiencing the symptions of low testosterone levels. I was always fatigued, had erections problems and whatever else goes along with low test levels. I seemed to have most of the symptons. So I went to the doctor and asked to have my testosterone levels checked. The results came back at 333. I can't remember what the units of measure are but supposedly the normal range is from about 250-800. So I was in the low range of normal. I had already discovered the ROP so I decided to give it a try to see if I could raise my test levels. I ordered the materials from McMasters and built my own. It was producing the proper voltage so I assumed it was doing it's job. I wore it 24hrs a day every day. I didn't notice anything until about 2 weeks into it. I was starting to have a lot of night time and morning wood. It seemed as though I was rock hard everytime I woke up. And I did seem to have better erections during sex. That was great! I hadn't experienced that in a long time. However, I didn't notice my balls getting bigger, or having bigger loads, or shooting further. Just the improvement in erections. However, I was happy with that. I continued to wear it every day and at about 12 weeks, I had another doctors appointment. I was curious to know if my testosterone levels had actually increased so I asked the doctor to test me again. I didn't think she would but she agreed. This time the result was 161. Well below normal. At that point I thought, well, so much for the great ROP experiment and I quit wearing it. I guess for me, it did have some benificial affects but it surely did not raise my testosterone level.