Ultima Pharmaceuticals supplies Drostan P 100 as a single 10 ml vial, each milliliter carrying 100 mg of drostanolone propionate. The propionate ester distinguishes this formulation structurally from drostanolone enanthate, which attaches a longer ester chain to the same base steroid. You receive one vial per pack, labeled for injection.

100 mg/ml Concentration in the Ultima Vial

The 100 mg per ml specification sits below the 150 mg and 200 mg concentrations other labs print on competing propionate labels. Masteron 100 from Gomeisa Labs matches the strength, while higher-dosed vials occupy the same category. Ultima Pharmaceuticals, based in the USA and manufacturing since 2022, produces this line under its own label.

Propionate Ester Structure

Drostanolone propionate carries a three-carbon ester, shorter than the seven-carbon enanthate ester found in formulations such as the Gomeisa masteron propinate. The ester length defines the compound's chemical structure, not its active steroid base, which remains drostanolone in both. This vial holds the propionate variant exclusively.