Buy GP Deca 300 and GP Phenyl 100 by Geneza Pharmaceuticals at Best Anabolic Steroids. Seven and a half grams of nandrolone sit behind this page in two packs: Deca 300 at 300 mg per ml and Phenyl 100 at 100 mg per ml, both in 10 ml multi-dose vials. One hormone, two esters, and a difference in pacing wide enough that the two are rarely interchangeable in a plan.
The notes below are educational reference material built from the product label values and from published pharmacology, not a treatment recommendation for any condition.
Product Overview
Nandrolone is a 19-nor androgen, which means the carbon-19 methyl group of testosterone is missing. The result is an anabolic-to-androgenic ratio among the highest in this class, an aromatisation the sources describe as slow and at about a fifth of testosterone or less, and a documented weakness for the libido when the compound runs without a testosterone base.
Deca 300 carries the decanoate ester, with an elimination half-life reported between six and twelve days after an intramuscular injection. That long tail is what makes one or two injections a week practical and what makes the compound so slow to leave: markers of nandrolone have been read in urine at four and at nine months after a single dose in one published study, and vendor material quotes a window of twelve to eighteen months.
Phenyl 100 is the phenylpropionate ester. Vendor sources put its active life at two to three days, other references nearer four and a half with a range of 2.7 to 4.5. It behaves like a short ester: faster start, faster exit, and injections every other day to hold a level.
Dosage Protocol
The cited tables quote weekly totals for the decanoate and split dosing for the short ester. Start at the bottom of the range and read the response before raising it.
| Beginner | 200-300 mg per week for 8-12 weeks, starting at the lower figure quoted in the literature and vendor material |
| Intermediate | 400-600 mg per week for 8-12 weeks; decanoate twice weekly, phenylpropionate pinned every other day in smaller amounts |
| Advanced | Above 600 mg per week for 8-12 weeks; the sources give no specific ceiling and note that prolactin and suppression climb with the dose |
| Female | The sources document no female dose for nandrolone; acne, body hair growth and voice change are the class risks and this is not presented as a safe low-dose option |
| Administration | Deep intramuscular injection, gluteal site typical; decanoate one or two times weekly, phenylpropionate every other day, with rotation of injection sites |
Blood work from week four onwards is the practical guide: estradiol, prolactin, a full blood count and the lipids, then again before the cycle closes.
Suggested Protocols
Nandrolone is almost always the second compound in a plan, sitting next to a testosterone base rather than replacing it.
What to Expect
The fact sheets behind this page do not carry a week-by-week expectation list for the nandrolone pair, so what follows is honest about that: the timing comes from the half-lives and from the side-effect notes rather than from a published schedule.
Decanoate needs its ester to accumulate, which is a matter of weeks at the two-day to twelve-day release reported above; the phenylpropionate pack reaches a working level far sooner and also leaves sooner. Strength and weight gain are described as steady rather than explosive, and comfort in the joints is the effect users most often report anecdotally rather than one measured in the cited material.
Progestogenic activity rather than aromatisation is behind the chest sensitivity sometimes seen even when estradiol looks fine, and the suppression of natural production is strong in both esters: this is the reason a testosterone base and a real recovery plan are treated as part of the protocol rather than as options.
Side Effects and Management
Post-Cycle Therapy
Timing differs sharply between the two packs, because one ester is gone in days and the other in weeks.
Estradiol during the cycle is managed with an inhibitor or a SERM read from a panel, never from a fixed calendar. A low exemestane dose is one option the sources describe for that job, and anastrozole is the other common choice.
Handling the Two Vials
Both packs are oil solutions and want the same treatment: a cupboard at room temperature, away from light, cap tight, vial upright. Do not freeze them and do not leave them in a hot car. Because Deca 300 holds three times the concentration of the phenylpropionate pack, it can be the thicker of the two to draw and may leave more soreness at the site; warming the vial in the hands and rotating sites helps. Discard anything that looks cloudy or separates.
Buying Geneza Deca and NPP Online
Both nandrolone packs appear in the Geneza Pharmaceuticals catalogue at Best Anabolic Steroids with the ester, the strength and the vial size spelled out, so the injection schedule can be matched to the pack before ordering. Dose, prolactin or recovery questions can be answered before checkout, and the surrounding items most plans use, from Anavar 50 for a leaner block to clomiphene for the restart, are stocked on the same shelf.
