The D600 is the concentrated end of the Pharma Nan range: six hundred milligrams of nandrolone decanoate per millilitre, ten millilitres to the vial.
At that density the oil carries a large solvent fraction and behaves accordingly - slow to draw, slow to push, and warmed in the hand by many before it is used at all. The active is no different from the weaker versions of the same product, a long-acting ester of 19-nortestosterone whose release is counted in weeks. The reason such a strength exists is simply that a given amount of hormone takes up a fraction of the volume it otherwise would.
