Nandrolone Decanoate (Deca-Durabolin) offers several key benefits and pros in bodybuilding, especially for extended bulking cycles focused on mass and recovery
$97
Deca 300 is nandrolone decanoate dosed at 300 mg/mL in a 10 mL multi-dose vial. Nandrolone is the compound most people know by the original trade name Deca-Durabolin, and it remains one of the most widely discussed injectable compounds in strength sport because of its reputation for slow, steady lean mass and its effect on connective tissue.
Structurally, nandrolone is a 19-nor compound: it is testosterone with the 19th carbon removed, which is why it is grouped with trenbolone acetate and NPP rather than with the testosterone esters. That single structural change is responsible for most of what makes nandrolone different, both the benefits people want and the problems they underestimate.
Every batch we stock is third-party HPLC tested for purity and identity before it is listed. If you are looking to buy Deca 300 online from a US domestic source, the lab testing and the concentration are the two things worth checking first.
Nandrolone binds the androgen receptor with strong anabolic and comparatively weak androgenic activity. Published myotrophic to androgenic ratios put it around 11:1 relative to testosterone propionate, which is the pharmacological basis for its reputation as a compound that builds tissue without the same degree of androgenic load.
Two other properties matter more in practice than the receptor binding:
It also increases nitrogen retention and stimulates collagen synthesis to a greater degree than most other anabolic compounds, which is where the joint reputation comes from.
Oil-based nandrolone can cause post-injection soreness in people who are sensitive to it, particularly with the larger ester. If you have had issues with oil-based gear before, that is worth knowing up front rather than after the first pin.
The decanoate ester is a long one. Nandrolone decanoate has a reported elimination half-life of 6 to 12 days when injected intramuscularly, and the clinical literature describes dosing intervals of once every one to four weeks depending on the indication. Duration of anabolic action is generally given as 2 to 3 weeks, with nitrogen-balance studies suggesting 18 to 25 days.
The practical consequence is that nandrolone is a slow compound in both directions. Blood levels take weeks to stabilise, so nothing much appears to happen early, and they also take weeks to clear once the last injection is done. That long tail is what pushes PCT timing much further out than it would be with a short ester like testosterone propionate.
Free nandrolone itself, once the ester is cleaved, has a half-life of under 4.3 hours. The ester is doing all the work of extending the release.
This is nandrolone’s signature and the main reason people pick it over other bulking compounds. It stimulates collagen synthesis and synovial fluid production substantially more than most anabolic compounds, which is why lifters with cranky shoulders, elbows, and knees often report relief on it while doing heavy compound work.
One honest caveat that most stores selling nandrolone do not print: this is symptom relief, not repair. Increased collagen synthesis and synovial fluid mask joint pain during use. They do not heal a structural injury underneath, and feeling nothing while training through a real injury is a good way to make it worse. Treat the joint relief as a comfort effect, not as a green light.
The best known nandrolone side effect has its own slang name. “Deca dick” refers to erectile dysfunction and flattened libido, and it is not a myth or a placebo. It comes from three things stacking:
Three things reduce the risk, and they are the reason nandrolone is almost never run on its own:
If you take one thing from this page: nandrolone is a compound that punishes people who run it bare and reward people who plan the support around it.
Published clinical use of nandrolone decanoate sits far below what is discussed in strength sport, and the medical indications are anemia, chronic kidney disease, postmenopausal osteoporosis, aplastic anemia, and wasting syndromes rather than performance.
In the literature describing non-medical use, nandrolone is typically discussed as a long-cycle compound run for 12 to 16 weeks, reflecting the fact that a 6 to 12 day half-life needs many weeks to reach steady state. Shorter runs are widely regarded as wasting the compound’s slow onset. Because of the ester length, injection frequency in that literature is generally once or twice weekly.
We do not publish protocol recommendations. Specific doses, ratios to a testosterone base, and cycle lengths depend on individual factors that no product page can assess, and the risk profile is dose dependent. This section is descriptive of published material, not advice.
Documented adverse effects of nandrolone decanoate reported in the literature include endocrine effects such as virilisation, gynecomastia, hormonal disorders, dyslipidemia, genital alterations, and infertility, along with cardiovascular dysfunction, skin disorders, and psychiatric and mood changes.
The nandrolone-specific ones worth flagging:
Nandrolone’s “mild” reputation is about its androgenic ratio, not about its overall safety. Those are different claims.
Deca vs NPP: Same parent hormone, different ester. NPP is nandrolone phenylpropionate, a short ester with a much faster clearance, so it needs frequent injections but stabilises and clears in a fraction of the time. People who want nandrolone’s joint and mass effects without committing to a compound that lingers for months often choose NPP. Deca is the set-and-forget version; NPP is the controllable one.
Deca vs trenbolone acetate and trenbolone enanthate: Both are 19-nors, and both are progestogenic, but they are not interchangeable. Trenbolone is dramatically more androgenic and more harsh, with night sweats, blood pressure, and mood effects that nandrolone does not usually produce. Nandrolone is the slow lean-mass and joint compound; trenbolone is the recomposition compound. The shared 19-nor structure means both carry prolactin considerations, which is why cabergoline comes up on both pages.
If you are drug tested for any reason, this section matters more than everything above it. Nandrolone has a detection window reported at 17 to 18 months, which is the longest of any commonly used compound by a wide margin. Positive tests have been reported 12 to 18 months after a final injection.
The reason is the metabolite. Nandrolone is detected through 19-norandrosterone in urine, which remains measurable at extremely low concentrations long after any anabolic effect is gone. Under WADA-style testing, 19-norandrosterone above 2 ng/mL constitutes an adverse analytical finding. Detection varies widely between individuals: in one study of eleven men given a single 150 mg dose, nandrolone use was still identifiable at 4 months in six of them and at 9 months in three.
Tested athletes should treat nandrolone as effectively disqualifying for well over a year after the last injection. No amount of clearance time planning makes this compound safe for a tested competitor.
Because nandrolone suppresses hard and clears slowly, post-cycle timing is pushed much further out than with a short ester. With a 6 to 12 day half-life and 2 to 3 weeks of action, meaningful clearance takes weeks after the final injection, and starting a recovery protocol before the compound is out is generally regarded as wasted effort.
The support compounds that come up in nandrolone discussions are cabergoline for prolactin, Arimidex or Aromasin for estrogen from the test base, and Nolvadex with Clomid for recovery. Timing and whether any of it applies to you is a discussion for a qualified medical professional, not a product page.
Nandrolone is one of the more commonly underdosed and faked compounds on the grey market, partly because its slow onset makes it hard for a buyer to tell whether the vial is real. Nothing much happens for several weeks either way. That is exactly why independent testing matters more here than on a fast compound.
Our nandrolone is third-party HPLC tested for purity and identity. You can review our published lab work on the HPLC test reports page, and a COA for this batch is available on request through our support channels.
KGEAR U.S ships Deca 300 (nandrolone decanoate) domestically within the United States. If you are searching for Deca-Durabolin for sale, nandrolone decanoate for sale, or trying to work out where to buy Deca 300 in the US, here is what applies to this listing:
Browse the rest of our injectables range, including NPP if you want the short-ester version of this compound and Test E 250 for a matching-ester testosterone base.
The active compound is the same. Deca-Durabolin is the original trade name for nandrolone decanoate. Deca 300 refers to the labelled concentration, 300 mg per mL.
Reported at 6 to 12 days for the decanoate ester via intramuscular injection. Free nandrolone, once the ester is cleaved, has a half-life of under 4.3 hours. Clinical dosing intervals are described as once every one to four weeks.
It can. The cause is a combination of testosterone suppression, nandrolone’s progestogenic activity, and elevated prolactin. It is most associated with running nandrolone without a testosterone base or without managing prolactin and estrogen. This is why nandrolone is rarely run alone.
Yes, but weakly. Conversion to estradiol is around 20% of testosterone’s rate or lower, and one study found virtually no aromatisation. It is far less estrogenic than testosterone, but “less” is not “none”, and any testosterone base run alongside it converts normally.
Longer than almost anything else. Detection windows of 17 to 18 months are reported, via the metabolite 19-norandrosterone in urine. If you are subject to testing of any kind, nandrolone should be treated as off the table.
Same hormone, different ester. NPP clears in a fraction of the time and needs more frequent injections, which makes it easier to control and easier to stop. Deca needs weekly injections at most but takes weeks to reach steady state and weeks to clear. Neither shortens the detection window meaningfully.
It increases collagen synthesis and synovial fluid production more than most anabolic compounds, and joint comfort is one of the most consistently reported effects. It masks pain rather than repairing damage, so training through a real injury because it stopped hurting is a genuine risk.
Yes. Third-party HPLC testing for purity and identity. Published reports are on our HPLC test reports page and a COA for this batch is available on request.
Disclaimer: This information is provided for educational purposes only and is not medical advice. Nandrolone decanoate is a controlled substance in the United States and in many other countries. Nothing on this page is a recommendation to use it, a protocol, or a suggestion that any use is safe or legal. Anabolic compounds carry documented risks including cardiovascular, endocrine, hepatic, and psychiatric effects. Consult a qualified healthcare professional before making any decision about your health. Customers are responsible for knowing and complying with the laws that apply to them.
This product is intended for research or educational purposes only and is not approved for human use unless prescribed by a licensed healthcare professional. Always consult a medical expert before beginning any supplement or hormone program.
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