Thanks for the clarification... as for the Sustain, not looking for a "bridge" actually... I see Derma as a "building" tool, one that also makes you feel better all around.... I see Sustain as a "recovery" tool... so just wondering if there is any point in running Sustain during the let-down period after a cycle, and before getting bloodwork, for those on HRT... obviously only time will bring test levels down... I'm not sure Sustain will do anything to recover liver enzymes and lipids... the only other thing is regulating estrogen, which Sustain also does... so if only for that aspect of P C T, I guess I'm wondering if it's worth using.... since at that point you may not be running an A I anymore.