NPP – Deca 125 EU

Images are for illustrative purposes only


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: R500.Current price is: R450.

SKU: EU007


Nandrolone Phenylpropionate, known as NPP for short, 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 Deca 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



Pack Size

10ml Vial


EU Pharma

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.

NPP vs. Deca-Durabolin

The well-known and very popular steroid Deca-Durabolin is also a Nandrolone steroid. It is the same as the Nandrolone steroid in NPP, but simply makes use of a different ester. While the ester used in NPP is Phenylpropionate, Deca-Durabolin is the brand name of Nandrolone decanoate. An ester attaches to the Nandrolone hormone and controls the way the hormone is released in the body once it has been injected.

By understanding different esters and how they work, it’s possible to create a steroid stack that contains compounds that use the same or similar esters, and this can make it easier to plan your post cycle therapy afterwards. At other times, you might want to combine short and long esters for different purposes. With Nandrolone available in these two ester types, you have the option to pick the one that best suits your plans and goals.

The hormone itself does not change once the ester detaches. NPP itself used to be known by the brand name Durabolin, giving us another indication of just how similar these two products are.

So, what are the real-world differences between NPP and Deca-Durabolin and which is the better choice for your goals?

With both compounds you get all the same benefits of Nandrolone which means excellent joint relief and therapeutic effects, improved recovery, excellent steady mass gains, greatly increased anabolic function and a lower level of androgenic effects compared with other steroid hormones.

The half-life of NPP and Deca-Durabolin differ remarkably and that is the main difference to consider between the two. Nandrolone Decanoate has a very long half-life of 6 to 8 days. This means it takes a day or two to even start circulating in the body enough to get its effects, and it will remain in the bloodstream for well over a week.

This shorter ester of Nandrolone requires much less frequent injections but also requires a longer cycle because of how long it takes for the effects to become active and beneficial. A Nandrolone Decanoate will normally be run for up to 16 weeks to gain maximum benefits of this slow acting form of Nandrolone.

Nandrolone Phenylpropionate has a much shorter elimination half-life of about 3 days, so you’ll need to inject this compound much more often to maintain optimal blood levels. It is usually injected three times per week.

Both types of Nandrolone contain the same active hormone, but if you’re after a faster acting form then NPP is the best choice. If you plan to do a longer cycle and want to inject Nandrolone less often, Nandrolone decanoate may be the best choice for you.



NPP delivers wide ranging results that will significantly boost performance and outcomes for all different types of athletes.


Your results will not only depend upon the effects of NPP, but just as much on the quality of your workouts during your cycle, your diet and just as importantly: what you do after the cycle to maintain your gains.

Here are the main results and advantages you can expect to see when using NPP:

  • Reduced stress hormones – by reducing cortisol stress hormones, muscle gains are more easily made and maintained and there is less tendency to gain fat. Stress hormones can rise with intense exercise, so NPP will work to reduce these hormones and keep your body in an anabolic state.


  • Increased nitrogen retention – a drop in nitrogen puts the body at risk of catabolism where muscle is lost. Balancing nitrogen is vital for maintaining an anabolic state, while negative nitrogen causes muscle tissue to be destroyed. NPP boosts nitrogen retention effectively, making this one of the most powerful aspects of this steroid.


  • Raise red blood cell count – improved endurance of the muscle with extra red blood cells transporting oxygen allows you to work out harder and longer, speeding up your results.


  • Boost protein synthesis – one of the most important effects of NPP is its boost to the synthesis or protein which provides the muscular building blocks. This speeds up muscle gains much more rapidly than if steroids are not being used.


  • Improved recovery – with increased red blood cells carrying more oxygen, the muscles can recover faster. Joints and muscle have a reduced tendency for soreness with Nandrolone’s therapeutic effects including a boost to collagen synthesis.


NPP has excellent benefits and effects for both bodybuilders and performance athletes. Athletes will value the recovery and therapeutic boost, while the seasoned bodybuilder will include NPP to gain the all-round benefits of enhanced recovery, muscle preservation and mass gains.

Side Effects

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.



NPP will suppress your normal testosterone function considerably, so post cycle therapy is critical after doing a cycle that includes NPP – whether it is being stacked with any other compounds or not.

PCT ensures you get your testosterone back on track after the steroids have suppressed production by providing the body with an external source of this critical hormone.

This also relates directly to your results: testosterone is vital for maintaining muscle mass and avoid fat gain. Post cycle therapy therefore can be considered as important as the cycle itself, and any missteps in your PCT can make your entire steroid cycle a waste of time if you aren’t going to maintain the gains you’ve made.

The timing of the start of your PCT will not only depend on NPP itself but on any other compounds being used in the cycle and their half-lives and suppressive effects. If you don’t do any PCT, testosterone levels will take a significant amount of time to get back to normal levels and during that time, severe symptoms of low testosterone will happen as well as rising estrogen levels.

This makes post cycle therapy critical as the halting of exogenous testosterone during your steroid cycle stops, leaving the body with little or no hormone production.

Most NPP users will start PCT anywhere from three to 12 days after the final injection of the cycle. It is recommended to start earlier rather than later to avoid the onset of any symptoms of low testosterone like fatigue, loss of libido, depression, weight gain and muscle loss.

A combination of the Clomid and Nolvadex (Tamoxifen) is the most used and most effective PCT strategy. Using these drugs for 4 weeks will get your testosterone working as it normally should. Dosages will differ depending upon your individual steroid cycle and level of testosterone suppression, and most users will start at a higher dose then decrease it for the second half of the PCT cycle.

Here is an example PCT cycle to follow an NPP cycle:

·         Week 1: Clomid 50mg, Nolvadex 40mg

·         Week 2: Clomid 50mg, Nolvadex 40mg

·         Week 3: Clomid 25mg, Nolvadex 20mg

·         Week 4: Clomid 25mg, Nolvadex 20mg


To ensure gains are maintained to the maximum level, training should continue at a relatively high intensity right through your PCT cycle even if endurance and strength isn’t going to be felt at the same level as when you’re on steroids.

Shipping & Returns

Looking for a bit more information about how online orders are processed? Here are some commonly asked questions and answers regarding our Online Shop!

How do I know that my order has been received?
When your order has been successfully received by our system, you’ll see a confirmation page. A confirmation e-mail will also be sent to the e-mail address you specified, giving the details of your order. This confirmation indicates that your order has been received. If you can’t find this confirmation email, check your spam or junk mail folders.

Fulfilment of your order may be impacted by stock availability however an email will be forwarded to you once your order is packed and ready for shipping. This email will include tracking details so that you can trace your parcel.

I live outside of South Africa, can I place an order?
Unfortunately, we only deliver to addresses within South Africa at this stage.

I live in South Africa, how much does shipping cost?
Shipping from our Anabolics ZA site is only R 150 nationwide!

When will be delivery arrive?
All orders are sent via a door-to-door courier service. Please make sure that there is someone to receive your order at your nominated address between Monday to Friday, 9:00am-5:00pm. Please note that your order will take 2 – 3 working days from date of payment to arrive. Deliveries to outlying areas may take longer.

Can I make a change or cancel my order after purchasing?
No changes and cancellations are not possible once the order has been processed and an order confirmation screen is displayed.

What is the return policy and process?
Anabolics ZA products are medicines so we cannot refund or accept returns. If you are unsatisfied with your order in any way, please contact us within 30 days of your order via email and we will do our best to resolve your issue.

I have an issue with my order – what do I do next?
Contact us if you have any queries about your order. Refer to your order number as a reference.

Trending Products

Our latest and most popular products