Drostanolone Propionate (Masteron)
Also known as Masteron, Mast P, Drostanolone
A dry, cosmetic DHT-derived steroid used near the end of a prep for hardness and definition.
Anabolic steroid — not a peptide
This compound is an anabolic steroid, not a research peptide. It has a different risk profile, legal status, and side-effect spectrum. The information here is for education only and is not medical advice or a recommendation to use. Read the medical disclaimer.
How it's taken (route)
a deeper shot into a muscle, usually the glute, thigh, or shoulder
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- Documented dose
- 50–150 mg
- Typical frequency
- Every other day
- Cycle
- 8 weeks on, 8 off
- Half-life
- Roughly 2 days
- Common vial sizes
- 100 mg
- Regulatory status
- Controlled anabolic steroid (Schedule III in the US). Prescription only.
Dose on a U-100 syringe
This dose is too large to draw in one standard U-100 insulin syringe at common mixes. It is typically drawn from a larger vial, mixed at a higher concentration, or split into more than one injection. Run your own vial through the reconstitution calculator.
What it does
Masteron propionate does very little for size but is valued for a hard, dry look when body fat is already low. It also acts as a mild anti-estrogen. At higher body fat, most people notice nothing at all. Short ester means every-other-day injections.
Mechanism
DHT derivative that binds the androgen receptor and mildly blocks aromatase activity. Does not aromatize itself, so no estrogen conversion.
Storage — lyophilisedwhat's this?
Oil solution: room temperature, away from light.
Storage — reconstitutedwhat's this?
Keep the vial clean and use within the labelled shelf life.
Reconstitution noteswhat's this?
Ready to inject. Frequent injections - rotate sites carefully.
Commonly reported side effects
- Accelerated hair loss in predisposed people
- Acne and oily skin
- Lower HDL cholesterol
- Suppression of natural production
- Aggression in some users
Contraindications noted
- Male pattern baldness sensitivity
- Prostate concerns
- Cardiovascular disease
- Pregnancy or breastfeeding
- Under 21 years of age
Research notes
Once used clinically for breast cancer. No modern human research at cosmetic doses. Benefits are visual and only meaningful at low body fat.
Vendors carrying Drostanolone Propionate (Masteron)
These research suppliers list this compound. Prices, vial sizes and testing vary — always check the current lot certificate before you buy.
Peptide Streak does not sell peptides and is not affiliated with these vendors. Some list metabolic compounds under coded product names.