I haven't tried Natadrol before, however, I have ordered it, so I'll be trying it myself very soon. From looking around and reading, this is all I gathered so far. I doubt you'd feel any of the effects of Natadrol while taking a PH. Natadrol seems to be a fairly weak androgen with mild anabolic properties. If you have only one bottle, then i'd take at least 8 caps daily then bridge into your PH, but my recommendation for a safe Natadrol run is to stack with any one of these, (LG's) M1D, Ghenerate or I-GH-1 and save the PH/DS for an entirely new cycle, but I'm just saying, cause nobody has replied yet.