Bull Pharma supplies Mastebull as a single 10 ml vial, each milliliter carrying 100 mg of Drostanolone Propionate in injectable form. The propionate ester distinguishes this product from the enanthate variants also available, and the vial format offers a higher total volume than ampoule packs of the same concentration.

Propionate Ester in a 10 ml Masteron Injection Vial

The propionate ester attached to drostanolone sets the release profile apart from enanthate options. Bull Pharma's Mastebull vial holds 10 ml at 100 mg/ml, matching the concentration found in masteron 100 from Gomeisa Labs, though that listing uses ampoules rather than a vial. The drostanolone ampoule format from Gomeisa Labs carries the enanthate ester at 200 mg/ml across five 1 ml ampoules, a different ester and a different pack structure. Comparisons of ester speed, duration and timing belong in the guides rather than on this page, which covers only what the label states and how the specifications differ between listings.

Single Vial Pack at 100 mg/ml Concentration

Each Mastebull pack contains one vial. The 100 mg per ml dosage sits below the 200 mg/ml concentration of the enanthate offerings, and the 10 ml size gives a larger single container than the 1 ml ampoule splits. Where another lab divides the same total across multiple ampoules, this vial keeps it in one sealed unit. Bull Pharma, based in the USA, has produced masteron propionate for sale and other applications since 2022. The specifications printed on the Mastebull label—100 mg, 10 ml, propionate are the points to weigh when setting this product beside others in the same category, and the vial format versus ampoule packs is a practical distinction that affects handling and storage rather than content.