Yeah these 2 compounds are different (Halo & OT) but so many think Halo is simply a PH of OT & that's it. I was lead to believe this at 1st too but Halo is a bit more androgenic & little less anabolic. The Q ratios (anabolic:androgenic) for OT is 8.83 so it's 8.83 times more anabolic than androgenic. Halo's ratio is 2.6 so it's 2.6 times as anabolic as it is andro. Wiki lists OT having anabolic# of 53 and andro# of 6 but this is on a scale from 1 to 100. I'd imagine for comparison purposes only that the Vida Q ratios (A:A) for Halo would be abouts 78:30 and OT would be more like 111:13 as I said before of Halo being less anabolic but having a little more androgenic. The vida #'s should be used for comparison reasons only as they're just a reference. Some compounds bind 'more strongly to' receptors - therefore some compounds with lower A:A #'s could actually be stronger than a higher # compound if they bind more strongly. As the case with Masteron. It has a low androgenic# but it's a somewhat potent androgen as it binds to the andro receptors much more strongly than many anabolics.