I only used a single bottle of 6-oxo after I tried PHs for the first time. I did 1-AD @ 400mg/ed with 4-AD @ 1200mg/ed. To be honnest I'm not sure the 6-oxo did anything for me, but it was the one time I did it so I have no idea what might of happened if I didn't take it. Maybe you can judge this by my results, I started at 185 and went up to 200. Once I finished with my 6-oxo my weight was at 195, and its still between 195 and 200 today. My strength also dropped a little bit after I stopped the PHs, but nothing worth crying over.