I used it. I'm not actually sure if it worked or not (I'll elaborate). I just finished my second cycle and ran hcg 5000 at about 250-300iu's twice a week. Now my nuts shrank big time on my first cycle (which was only about 6 weeks several years ago). This cycle was 12 weeks and I didn't think they shrunk much because I didn't start hcg til about 3 weeks in. But now in my PCT with clomid and dermacrine they are getting bigger so they must have shrank slowly which explains how I might not have noticed. So thats my experience with hcg 5000. Sorry its hard to judge by that but it was my first time with hcg and I'm not sure if it worked.