NPP – Deca 100 (Dura-Ject) HD

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Nandrolone Phenylpropionate (NPP) is a testosterone derived anabolic androgenic steroid. NPP is a 19-nor steroid due to a modification of one atom. Compared with dihydrotestosterone, NPP has less androgenic activity while having more anabolic activity than unmodified testosterone.

This substance is very similar to the more common and well-known Deca Durabolin with main ingredient nandrolone decanoate. The main difference between the two is the ester attached to the nandrolone compound. Deca 100 Fast has a shorter phenylpropionate attached than the more popular long acting decanoate.

Nandrolone releases from the site of injection over a 2 to 3 weeks period. NPP 100 Fast releases from the injection site and lasts about a week in the system. NPP 100 Fast acting is therefore best when being injected every 2 to 3 days to keep the levels in the system level. Apart from the time these two substances releases and last in the system, Deca Durabolin and NPP 100 Fast are virtually interchangeable. Nandrolone phenylpropionate shows a sharp increase in blood serum levels of the free form of nandrolone within 24 to 48 hours from the time of injection. Because of this sharp increase and quick release of nandrolone this product is sometimes preferred to the longer acting version. After athletes compete and they battle with joint pain they prefer this substance because the longer acting version will take too long to kick in.

This substance is not as androgenic as testosterones, but this does not mean it is not androgenic at all. At high doses it will have some androgenic effects. In other words, at low doses, you will have very few androgenic effects but at high doses you might experience oily skin, acne, and body/facial hair growth. Male pattern hair loss, deepening of voice and clitoral enlargement in females is also possible. Liver toxicity with this substance is very unlikely because it is not a c-17 alpha alkylated.

Original price was: R320.Current price is: R288.

SKU: HD011


NPP (Nandrolone Phenylpropionate) is a form of Nandrolone with the phenylpropionate ester attached. Another well-known form of this steroid compound is Nandrolone Decanoate, also known as Deca-Durabolin. While NPP also used to be called Durabolin in the past, these days that name is avoided to prevent confusion between the two forms.

The Nandrolone hormone compound is the same in both forms, it is simply the ester which gives each a slightly different property in the body; especially when it comes to half-life and how fast it works, and how long it stays active in the bloodstream. This in turn dictates how often you’ll need to take your dosages.

NPP has a shorter half-life and so requires more frequent injections to keep your levels stable compared with Nandrolone Decanoate.

Nandrolone phenylpropionate in doses sufficient to promote muscle growth does suppress endogenous testosterone production. One 100mg nandrolone phenylpropionate injection shows a rapid suppression of serum testosterone levels. After about 2 to 3 days after the injection the serum testosterone levels will decrease by approximately 30% of the initial level. Testosterone levels will increase to a normal level after about 2 to 6 months.

Another advantage of NPP is its potential to provide joint pain relief and improve joint health. It has been reported to possess anti-inflammatory properties, which can alleviate joint discomfort commonly experienced by bodybuilders due to intense training and heavy loads. This steroid also enhances collagen synthesis, a protein crucial for maintaining healthy joints, tendons, and ligaments. This can lead to improved joint flexibility, reduced pain, and better overall joint integrity, supporting long-term training and minimizing the risk of injury.

Pairing NPP use with a well-designed training program can optimize results. Focus on compound exercises that target multiple muscle groups, incorporate progressive overload to continually challenge your muscles, and allow for adequate recovery between workouts. A structured program tailored to your goals and fitness level will help maximize the muscle-building and strength-enhancing effects of NPP.

Doses for men vary between 200mg and 400mg over an 8-to-12-week period. The weekly dose is usually split into two doses per week due to the short acting nature of the phenylpropionate ester. Recommended dose for woman is 50mg per week (single dose once a week injection) for no longer than 4 to 6 weeks

Additional information

Chemical Composition

Nandrolone Phenylpropionate


100mg / ml

Pack Size



HD Labs

Dosage Instructions

Your dosage of NPP will depend on whether you’re using it mainly for therapeutic purposes, or for performance enhancement.

When using this steroid to gain benefit from its therapeutic effects only, males can dose at 100mg to 200mg weekly and see substantial benefit including greatly improved recovery and joint relief.
For guys using NPP for bodybuilding a dosage of up to 400mg weekly is ideal. This strikes the right balance between reaping the benefits while keeping the side effect risk to a minimum. Those who are less concerned about side effects might consider increasing the dosage a little beyond 400mg but for most male users this will be the sweet spot that will deliver excellent results.
NPP is not an extremely fast acting steroid so cycle length should provide enough time to really see the benefits that this highly effect compound can deliver. Up to 12 weeks is recommended. The frequency of injections should be three per week, where the weekly dose is split evenly between injections. A three weekly injection routine ensures that blood levels of this steroid are evenly maintained throughout the cycle.
Females can make use of NPP but must be aware of the risks of virilization, and for that reason the female dosage should not exceed 50mg weekly for no longer than a 6-week cycle.

Effect on Cycle

Nandrolone is well known for its many positive benefits and effects when used for performance enhancement purposes. You’ll also find that this compound comes with some excellent therapeutic effects as well, making NPP a quality all round steroid that will suit a range of users and goals.

Here are the main benefits and effects that you can expect with NPP:

  • Mass building – NPP is an excellent mass builder, and many guys will include this steroid in every bulking cycle. Putting on quality muscle at a steady pace is a highly desirable benefit of NPP. This is not a compound that works super-fast to help you gain mass quickly, but if you’re after both high quality and high quantity muscle gains, then NPP delivers.
  • Recovery – NPP has excellent therapeutic benefits for the joints, and this is going to provide a significant boost to your recovery process. Expect to recover faster and be able to hit the gym for your next workout sooner, with greatly reduced muscle and joint soreness.


  • Lean muscle preservation – NPP has superb metabolic properties, and this will make it more efficient for you to maintain lean gains during the off season. Additionally, if used in a cutting cycle then NPP helps conserve your muscle mass while you work on losing fat. Again, this is thanks to the high metabolic properties of Nandrolone. While NPP is not commonly used as a cutting steroid as often as it’s used for bulking, it can provide a highly beneficial role in a cutting cycle for any user who understands its functions and benefits.
  • Strength – Some users may see some increase in strength, however NPP is not particularly known for its ability to significantly boost strength to a noticeable level. When stacking with NPP with other steroids, it is likely to be other compounds that take care of your strength boost as this is not an area that Nandrolone excels in.


  • Build Mass
  • Speeds up recovery
  • Preserves lean muscle
  • Boost strength

Nandrolone can be used for bulking or mass building, cutting, as well as for general athletic purposes. This makes it a highly diverse steroid that is often stacked with other compounds where it can contribute to more specific goals.

Additional Information

Every steroid will come with its own side effects profile risk, but experienced steroid users will be familiar with most of the potential side effects that can experience with NPP. Some of these are certain to occur because of the nature of using steroid hormones, while other side effects can be determined more by individual reactions.

Some guys will experience more severe side effects than others, but it’s important to be aware of everything that you could be dealing with, so you’re prepared to combat the side effects and focus on the positive benefits of NPP. This steroid can be considered one of the milder when it comes to side effects, however there’s no escaping some negative effects.

  • Here are the main side effects to expect when using NPP for performance enhancement:
  • Androgenic side effects: These effects are milder with NPP compared with many other steroids. This category of side effects includes acne and baldness, but only males who are predisposed to these conditions are likely to experience them and for most men, it will be relatively mild. Female users should be alert for signs of virilization like hair growth and deepening of the voice.
  • Estrogenic side effects: Nandrolone is an aromatizing hormone so estrogenic effects can come about when testosterone is converted to estrogen, although they are normally not as severe as with many other steroids. These include development of gynecomastia, water retention and associated increase in blood pressure. Users should be able to easily control these effects by using an aromatase inhibitor.
  • Testosterone suppression: As with all steroids, NPP is going to suppress your natural testosterone production and this effect is very strong when using this compound. For many guys it will only take one dose for most or even all your testosterone production to shut down. This can’t be avoided but must be mitigated by combining NPP in a cycle with a testosterone compound, so you don’t lose the vital bodily functions that this critical hormone provides. Following your NPP cycle you’ll need to implement post cycle therapy to speed up the stimulation of normal testosterone function again.
  • Cholesterol: Some users will experience a reduction in levels of good cholesterol (HDL) when using NPP. This effect can often be amplified through the combined use of an aromatase inhibitor, which many users are likely to also be taking to control estrogenic effects. Those with existing cardiovascular complications or high cholesterol should closely monitor cholesterol levels throughout, and all NPP users should incorporate a good amount of cardio work into workouts while maintaining a diet high in omega-3 fatty acids.
  • Liver toxicity: NPP is not known to be hepatotoxic in users who use the steroid sensibly and with suitable breaks in between cycles. However, all anabolic steroids can come with some risks to the liver, particularly when used at high doses or for prolonged periods of time.

Most male users of Nandrolone Phenylpropionate should be able to prevent or control the side effects well, and it’s more mild side effect profile makes it an appealing steroid to use for new users or those wishing to avoid the much more severe side effects that can be seen with some other compounds.

Female users may find that low doses of NPP bring about no or very little side effects, but this should be closely watched and when any signs of virilization begin the steroid should be stopped right away.

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