Geneza GP Mast - Drostanolone Propionate 100 and Enanthate 200

Name: Geneza GP Mast - Drostanolone Propionate 100 and Enanthate 200
Brand: Geneza Pharmaceuticals
SKU: OFFER-8467
Availability: OutOfStock

Injection · 100 mg/ml · 10 ml

Out of stock

Geneza Pharmaceuticals GP Mast is a drostanolone line in two packs: Drostanolone Propionate 100 for the short release and Drostanolone Enanthate 200 for the long one.

Drostanolone is a dihydrotestosterone derivative, so it does not aromatise and the ester alone decides the schedule. GMP-manufactured, HPLC-verified and shipped with the batch Certificate of Analysis (COA) on file. Current availability is shown on the page.

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Product overview

Geneza Pharmaceuticals GP Mast - Drostanolone Vials

GP Mast is the Geneza Pharmaceuticals drostanolone line, offered as two ester packs: Drostanolone Propionate 100 and Drostanolone Enanthate 200. Drostanolone, sold historically as Masteron, is a dihydrotestosterone derivative rather than a testosterone one, so the molecule is already reduced and cannot be aromatised into estradiol. The same compound appears as Mastaplex and Masteroxyl, and it is often compared with the oral DHT derivative Proviron 25.

Two ester packs: Drostanolone Propionate 100 and Drostanolone Enanthate 200
Oil-based intramuscular injection
GMP-manufactured and HPLC-verified, Certificate of Analysis (COA) on file per batch
Does not aromatise, but suppresses natural testosterone production

Variant Comparison

Both packs carry drostanolone; the ester sets the injection interval and the clearance time.

Variant	Dosage	Form and quantity	Best use
Drostanolone Propionate 100	100 mg per ml	Oil, multi-dose vial	Short run, frequent shots
Drostanolone Enanthate 200	200 mg per ml	Oil, multi-dose vial	Longer run, fewer shots

The propionate pack is the short ester and is injected every other day or so, which suits a run that is meant to finish quickly and clear quickly. The enanthate pack releases over a longer window, so injections are spread wider apart and the level stays smoother, but the compound also takes longer to leave the body. Volume differs too, since 200 mg per ml carries twice the dose of 100 mg per ml in the same millilitre.

How Drostanolone Works

Drostanolone is a reduced, dihydrotestosterone-type androgen, so it is not a substrate for aromatase and does not produce estradiol; the water retention that belongs to testosterone does not apply in the same way. It still binds the androgen receptor and it is reduced further by 5-alpha reductase activity in skin and prostate, which is the reason scalp hair and prostate effects are reported for this subgroup. As with every suppressive androgen, LH and FSH fall and natural testosterone production stops.

Dosage & Administration

No medical dose is stated on this page, because neither pack is a licensed medicine and community protocols are unverified. Frequency follows the ester: short propionate needs close scheduling while enanthate does not. There is no aromatisation step to manage, so an aromatase inhibitor such as Arimidex is not part of the default plan, but recovery still is: Nolvadex 20 mg daily for four weeks with Clomid as the alternative. Keep the vials at room temperature, away from light, heat and moisture.

For laboratory research only. Consult a healthcare professional before use.

Specifications

Trade Name	GP Mast
Generic Name	Drostanolone propionate, drostanolone enanthate
Manufacturer	Geneza Pharmaceuticals
Dosage	100 mg per ml or 200 mg per ml, depending on the pack
Package	10 ml multi-dose vial, two packs in the family
Drug Class	Injectable anabolic androgenic steroid, DHT derivative
Administration	Intramuscular injection
Storage	Room temperature, away from light and heat
Prescription Status	Research use only
Verification	Batch details confirmed with supplier
Shipping	International and U.S. domestic options

Stacks

Propionate in a Short Cutting Run

Drostanolone Propionate 100 sits at the end of a short run, injected every other day, where a fast exit matters as much as the hardening effect.

PCT: required - drostanolone suppresses natural testosterone.

Enanthate for Longer Protocols

Drostanolone Enanthate 200 is used where fewer injections are preferred and a steadier level across weeks is the goal, accepting a longer clearance.

PCT: required - begins after the ester has cleared.

Mast With a Testosterone Base

Because drostanolone does not replace the testosterone the body needs, both packs are normally run with a testosterone ester as the androgen base. The DHT derivative adds to the picture rather than substituting for it.

PCT: unchanged - Nolvadex 20 mg daily for 4 weeks, Clomid as the alternative.

Consult a healthcare professional before any cycle. Doses are common community protocols.

FAQ

Before you ask

Questions, answered

GP Mast is a Geneza Pharmaceuticals drostanolone line in two ester packs, Drostanolone Propionate 100 and Drostanolone Enanthate 200. Drostanolone is a dihydrotestosterone derivative known historically as Masteron, and in laboratory work it serves as a reference for the DHT subgroup. In sports it is used at the end of a cutting phase, together with a testosterone base. Both packs are oil-based multi-dose vials for intramuscular use.

The ester and therefore the timing. Propionate is released and cleared within days, so injections come every other day and the level moves quickly in either direction. Enanthate is released over a longer window, so injections are spaced wider, the level is steadier and the compound clears more slowly at the end. The drostanolone itself is identical, and the concentration differs: 100 mg per ml against 200 mg per ml.

No medical dosing schedule is published here, because these vials are supplied for research use and not as a licensed medicine. In community practice the ester sets the interval: the propionate pack is injected frequently and the enanthate pack much less often. No figure on this page should be read as a recommended dose.

The class warnings cover acne, oily skin, scalp hair loss, mood changes, irritability, aggression, sexual dysfunction and shrinkage of the testicles, plus serious risks of raised blood pressure, heart problems, stroke, liver damage and blood clots. Drostanolone is a DHT derivative, so scalp hair loss and prostate-related effects are reported with this subgroup, and it does not aromatise, so water retention is not the usual complaint.

Yes. Drostanolone suppresses LH and FSH, so natural testosterone production stops even though the compound does not aromatise. Recovery is planned after the last injection: Nolvadex 20 mg daily for four weeks, with Clomid as the alternative. With the enanthate pack the wait before recovery starts is longer, because the ester clears more slowly.

Yes, both ester packs are listed on this page with international and U.S. domestic shipping options. The page currently shows this offer as out of stock, so the stock label is the figure to watch, and orders ship discreetly once the pack is restocked. Check the stock label of the pack you want before ordering, because the two esters can be resupplied at different times.

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