Nandrolone phenylpropionate = npp
Nandrolone decanoate = Deca
Think test p to test e or c
Even though there is actually Test pp but not so common so I don't compare for you.
Phenylpropionate has up to 3 day half life
Reports of less water held (but depends on your fatness to begin with, if fatty think npp make hold less poof its mistaken)
Good for folka that pct or plan to switch compounds mid cycle without having a big over lap of compound
Ov course kicks in pretty quick compared to its pappii Deca
I recommend