Description
Nandrolone Decanoate (Deca, Deca-Durabolin) is the long-acting decanoate ester of 19-nortestosterone (Nandrolon). Structurally Nandrolon differs from testosterone only by the missing methyl group at position 19, yielding substantially lower androgenic activity at comparable anabolic action.
Per study reports the elimination half-life of Deca is about 6-12 days, allowing weekly or biweekly injections. Steady-state is reached after 3-4 weeks. Nandrolon is only weakly converted to estradiol via aromatase, but via 5α-reductase to dihydronandrolone (DHN) - a weakly-androgenic form that explains Nandrolon’s lower androgenic profile.
Deca has been in human medical research since the 1960s. Clinical applications included osteoporosis, cachexia, aplastic anemia, and HIV wasting. The substance is on the WHO list of essential medicines and is among the best-characterized anabolics overall.
Known effects in studies: high water retention through estradiol rise (at moderate doses), elevated prolactin levels with documented effects on libido and erectile function (“Deca dick” phenomenon in recreational reports), mild hepatotoxicity, unfavorable lipid profile. Very long detection in doping tests - up to 18 months.
You can order Nandrolone Decanoate as an oily injection solution in 10-pack at 250mg/ml.
This information is for research and educational purposes only. No medical recommendations.
Risks & Safety
Nandrolone Decanoate is among the best-characterized anabolics overall - the effects described in the literature are well documented and predictable through decades of clinical and recreational research.
Documented in studies and the application literature:
- Progestagenic and prolactinergic action: Nandrolon acts progestagenically and drives prolactin levels up. Libido decrease and erectile dysfunction are documented, described in recreational reports as the “Deca dick” phenomenon.
- Suppression of endogenous production: Nandrolon strongly suppresses endogenous testosterone production and additionally suppresses the DHT pathways. Testicular atrophy and reduced fertility are documented, a separate test base is mandatory in research practice.
- Weak aromatization: Nandrolon converts only weakly to estradiol, yet water retention is documented at moderate doses.
- Cardiovascular and liver: the literature describes an unfavorable lipid profile, cardiac effects in chronic use and mild hepatotoxicity.
Baseline bloodwork before, during and after a research protocol is strongly advised. This classification does not replace medical advice. Risk and responsibility for any actual use lie entirely with the buyer.
Studies
- Anabolic Effects of Nandrolone Decanoate in Patients Receiving Dialysis - JAMA 1999, Johansen et al: randomized controlled trial documenting significant lean-mass gains under nandrolone decanoate in dialysis patients.
- Effects of Pharmacological Doses of Nandrolone Decanoate and Progressive Resistance Training in Immunodeficient Patients Infected with Human Immunodeficiency Virus - JCEM 1999, Sattler et al: HIV-wasting study of nandrolone plus resistance training with gains in lean body mass and muscle cross-sectional area.
- The Effect of Nandrolone Decanoate on Bone Mineral Density, Muscle Mass, and Hemoglobin Levels in Elderly Women With Osteoporosis - J Gerontol A 2005, Frisoli et al: double-blind RCT on bone density and muscle mass in osteoporosis patients.
- Cardiovascular Toxicity of Illicit Anabolic-Androgenic Steroid Use - Circulation 2017, Baggish et al: cohort comparison showing reduced left ventricular function and accelerated coronary atherosclerosis in long-term AAS users.
- Impact of Nandrolone Decanoate on Gene Expression in Endocrine Systems Related to the Adverse Effects of Anabolic Androgenic Steroids - Basic Clin Pharmacol Toxicol 2009, Alsiö et al: animal study on gene expression in HPTA, HPG axis and steroid metabolism under chronic nandrolone.
