While Deca-Durabolin is the most commonly used Nandrolone based steroid it is far from the only one and in recent years the popular Nandrolone-Phenylpropionate has increased in popularity; commonly referred to as NPP and often found under the trade name Durabolin. In many ways NPP is very similar to the original Decanoate version; meaning, the nature of the hormones is for all intense purposes the same with either form. However, when examining the two compounds we have two distinct esters, one with the Decanoate ester while NPP is a Phenylpropionate ester based form. As each one carries its own ester NPP will become active in a noticeable way much faster but its total lasting effect is very short lived compared to the large ester based Nandrolone. Further, because Phenylpropionate is a smaller ester the total mass of the compound will yield more Nandrolone on a per milligram basis. At first glance this would seem to lend to NPP being slightly superior as it becomes active much faster but this isn’t necessarily true; while it will activate much faster, fast is not always beneficial, especially when we consider solidifying gains. However, in the long and short both compounds are very similar but some have said to report less water retention with the NPP form and this is common with smaller ester based steroids.
Nevertheless, real life experiences often show that the original may indeed be slightly more powerful; remember, real life and what’s on paper do not always matchup hand in hand and in the end you will have to find what works best for you.
Bioelectrical impedance analysis (often referred to as “BIA”) is an accurate method of estimating body cell mass. Instruments for reliable measurements of body composition are commercially available (., BIA Quantum; RJL Systems, Inc., Detroit). These devices can be used quickly in the office ( Figure 1 ) ; a minimum of staff training is required. Bioelectrical impedance analysis provides an estimate of the total body water by measuring changes in a low electrical current passed between electrodes placed on the upper and lower extremities. The sizes of other body compartments (including body cell mass) are then calculated using equations based on assumptions about the relationships between different body compartments and total body water. The validity and reliability of the results depend heavily on several factors, including correct placement of the electrodes, “normality” of body habitus, hydration status and the equations used to estimate body cell mass. 10