Nandrolone is the 19-nor hormone that has held a place in strength sport longer than almost anything except testosterone, and Xeno Laboratories offers it in the two ester lengths that matter: the decanoate and the phenylpropionate. Both are oil injections in 10 ml vials under a GMP process. The difference between the packs is how fast the ester is stripped away inside the muscle, not what the freed hormone does.
One thing does not follow the usual rules here. Nandrolone aromatizes far less than testosterone, and it also carries progestogenic activity, which means breast symptoms can appear while estradiol still reads normally on a panel. That single fact reshapes the monitoring plan for both esters.
Product Overview
Nandrolone decanoate, the classic Deca ester, releases over roughly six to twelve days and is normally injected once or twice weekly. Nandrolone phenylpropionate, sold here as NPP 100, is the short ester with an active life of two to three days, so it is given every other day; one reference set puts its half-life nearer four and a half days, which is why the practical interval is judged by effect rather than by a single figure. Both esters carry the same hormone, and both show one of the highest anabolic-to-androgenic ratios in the class.
Inside the body nandrolone binds the androgen receptor much as testosterone does, supporting protein synthesis, nitrogen retention and red cell production, but it resists the 5-alpha reductase enzyme, so it converts to a far weaker androgen than testosterone would in skin, scalp and prostate. Aromatization is limited, reported at around twenty percent of testosterone or less, so fluid retention is milder and gynecomastia from estrogen alone is uncommon. The trade-off sits in the progestogenic side: prolactin can climb, libido can drop even with normal estradiol, and the axis is suppressed hard by either ester. Neither pack is 17-alpha-alkylated, so liver injury is not described for nandrolone decanoate, although regulators keep a class warning about hepatic complications for anabolic steroids as a group.
The practical draw is joint comfort. Users report that connective tissue stops complaining during long heavy blocks, which is why nandrolone is added to mass cycles built on a testosterone ester and to older lifters who cannot tolerate the same load without it. It is not a cosmetic compound: the look it produces is fuller and smoother than a dry DHT drug would give, and pairing it with Winstrol on a cut is common precisely to offset that softness.
Dosage Protocol
The decanoate figure is written as a weekly total, the phenylpropionate figure as a volume every other day. Published and vendor material for nandrolone sits roughly in the 200-600 mg per week band, and the length of the cycle is set by how slowly the ester clears.
| Beginner | 200-300 mg each week of the decanoate over 8-12 weeks, starting at the bottom of the published band |
| Intermediate | 400-600 mg each week; decanoate twice weekly, NPP 100 split into smaller shots every other day |
| Advanced | Beyond 600 mg each week the sources give no defined ceiling - that figure is unconfirmed - and prolactin plus axis suppression rise with it |
| Female | No documented female dosing exists in the material used here; masculinization of voice, hair and skin is the class risk |
| Administration | Deep intramuscular injection, gluteal or thigh; decanoate once or twice weekly on a six to twelve day ester, NPP 100 every other day |
Because the two esters share a hormone, switching between them mid-cycle is a scheduling change rather than a pharmacological one. Bloodwork with prolactin and estradiol from week four is the sensible reference point.
Suggested Protocols
Three placements cover the usual reasons someone reaches for this hormone. The pills lead to the matching pages elsewhere on this site.
What to Expect
- Faster onset on the short ester. NPP 100 produces noticeable effects within the first week or two, whereas the decanoate needs weeks to reach a full blood level.
- Joints feel better early. Comfort in knees and shoulders is usually reported after one to two weeks on NPP 100 and after four to six weeks on the decanoate.
- Size and recovery from week four. Strength, appetite and recovery improve through weeks four to eight, with less fluid than an equivalent testosterone dose would carry.
- Results plateau around week eight. By weeks eight to twelve a normal cycle has given what it will, and further weeks add risk rather than size.
- The worst detection profile on the site. Metabolites have been found in urine four and nine months after a single injection, and vendor material stretches the window to twelve to eighteen months - a poor choice for anyone tested.
- Libido can fall even with normal estradiol. Prolactin is the usual explanation, and it is a bloodwork question rather than a guess.
- Lipid changes reverse, the axis does not. Regulators note that lipid values return to baseline after discontinuation, while natural testosterone stays suppressed until a recovery protocol is run.
Side Effects and Management
Both esters share one side-effect profile, and the items below are ordered from the most frequently reported downwards.
Post-Cycle Therapy
Start timing differs sharply between the two esters, which is the main reason they are not interchangeable at the end of a cycle.
