GP Test Blend 350 from Geneza Pharmaceuticals is listed on this page at Best Anabolic Steroids. One 10 ml vial carries 350 mg of testosterone per millilitre, divided across three esters: propionate, cypionate and enanthate. There is no second hormone in the oil, only testosterone on chains of three different lengths.
The text below is reference reading collected from the label values and from published pharmacokinetics. It describes behaviour and timing rather than offering a prescription, and it is not a route to treating any condition.
Product Overview
The label is weighted to the slow side. In every millilitre there are 50 mg of propionate, 100 mg of cypionate and 200 mg of enanthate, so the two long esters hold a little under nine tenths of the strength and the propionate arm exists only to raise the level within the first day or two. Enanthate and cypionate then take over and hold a flat line under a shot every three or four days.
Against a standard Testosterone Ester Range, the practical difference is concentration: fewer millilitres for the same weekly total and a faster start than a single long ester, without the daily pinning that propionate alone demands. Read against a five-ester formula such as Sustanon 270, this blend simply omits the phenylpropionate, isocaproate and decanoate arms and shortens the wait before recovery.
It remains plain testosterone. It aromatises as a whole dose and suppresses the axis at any effective amount, so estradiol control and a recovery plan are part of the run rather than extras.
Dosage Protocol
Nothing here is a licensed dose. The rows mix vendor references for the blend with the general testosterone bands this folder keeps.
| Beginner | 350 mg weekly for 10-12 weeks, which is 1 mL a week at this strength |
| Intermediate | 400-500 mg weekly for 10-12 weeks, split into two shots three to four days apart |
| Advanced | 700 mg weekly for 12-16 weeks, the upper end of the vendor range |
| Female | No documented protocol in the sources; virilization is the standing risk |
| Administration | Intramuscular oil depot every three to four days; warm the vial and rotate sites at this concentration |
The vendor example cycle sits at 400-500 mg weekly for ten to twelve weeks, so a first attempt at one to one and a half millilitres a week matches the low end. Published bands for testosterone in general start lower still, at 250-350 mg weekly, and both references are kept rather than blended together.
Suggested Protocols
The blend usually serves as the testosterone base of a run, with a second compound chosen for the goal.
Estrogen is read from a result rather than from the mirror. Arimidex is the aromatase option normally quoted with a testosterone base, started early here because the propionate arm is already converting in week one.
What to Expect
- Something inside two days. The propionate arm is releasing within 24 to 48 hours of the first shot, and vendor material describes a measurable hormone rise in that window.
- A steady line by week two. Enanthate and cypionate build to a working level that holds for a week or two after each injection, which is what a three-to-four-day rhythm is for.
- The familiar testosterone curve from week three. Strength, fullness and libido move in weeks three to six, and fluid and pressure follow estradiol rather than the ester mix.
- No size without food. The vial changes release timing only; calories, protein and training decide the visible result.
- Heavier shots than a 250 mg/mL product. The concentration means more oil in the muscle and more local soreness than dilute formulations, though less than 400 mg/mL products.
- Recovery becomes the clock once shots stop. Enanthate and cypionate set the washout, not the propionate that clears in three to four days.
Side Effects and Management
Almost every entry traces to two facts: the dose aromatises, and the axis stops producing while it runs.
Post-Cycle Therapy
This blend frees the user sooner than a decanoate-containing formula: the long esters governing the wait clear in about a fortnight.
Storage and the Vial
A 350 mg/mL oil is thicker than a 200-250 mg/mL product, and it behaves better at room temperature than in a fridge. Keep the vial upright, the stopper clean and the lid tight, in a cupboard away from sunlight and away from damp. Warming it briefly in the hand before a draw makes the oil easier to push and reduces the volume of dead space.
Read the label on arrival and confirm the strength and batch, because a higher-concentration vial is easy to confuse with a 250 mg/mL product at a glance. One needle for the draw and a fresh one for the shot keeps the multi-dose container clean; used sites should be rested before they come round again.
For the sibling formula with two extra long chains, Sustanon 270 runs 270 mg per millilitre and asks for a slightly longer wait before recovery begins.
