"NPP is the short estered cousin of Deca and has many of the same actions (so I won’t go into too much detail) but seems to be a bit weaker in all aspects (less mass, less strength, less water, less supression). It is fairly mild in terms of sides and doesn’t hold nearly as much water so it’s use in a cutting cycle is possible and it seems the gains are more easily maintained (but this may just be due to the reduced water retention). It’s generally used as a secondary to Test to add a bit of anabolic properties and aid the joints a bit. "
-From FuriousGeorge
Read up on short cycle planning: