That's true, I won't really know for sure. Considering I'm taking nearly twice as much 19-nor as 4&5-AD, I'd guess that's probably helping the most. Right now I'm hitting about 1200mg's of 19-nor compared to 600mg's of 4-AD. But it's just like with a gear cycle, most people don't take test by itself or deca by itself...rather you stack various AS together (dbol, sust, deca, etc.). You get better results from a stacked cycle than from a single AS alone.