Masteron Propionate

What is Mastesyn 150 (Drostanolone Propionate) by SYN Pharma?

Mastesyn 150 is SYN Pharma’s fast-acting injectable formulation of Drostanolone Propionate, commonly known as Masteron. This DHT-derived anabolic steroid is renowned for its ability to enhance muscle definition, hardness, and dryness during cutting cycles. Its natural anti-estrogenic properties also make it popular for physique competitors seeking a lean, aesthetic look.

The Propionate ester provides a quick onset of action and requires frequent injections, making it ideal for short to mid-length cycles focused on peak conditioning. Each vial delivers 150 mg/ml across 10 ml, totaling 1500 mg of active compound per bottle.

Benefits of Masteron Propionate

• Enhances muscle hardness and definition
• Supports fat loss and lean preservation in cutting phases
• Acts as a mild aromatase inhibitor (AI support)
• Zero water retention or estrogenic activity

Product Details

• Compound: Drostanolone Propionate
• Concentration: 150 mg/ml
• Volume: 10 ml per vial
• Total Content: 1500 mg per bottle
• Injection Frequency: Every other day recommended

Dosage and Administration

Typical Masteron Propionate doses range from 300 to 500 mg per week, injected every other day to maintain stable levels. Due to its DHT-based nature, Masteron does not convert to estrogen and works synergistically with testosterone or other cutting agents in cycles focused on body recomposition or contest prep.

8-Week Masteron Cutting Cycle Example

Common Questions About Mastesyn 150

Can Masteron Propionate be used alone?

While Masteron can be run solo, it performs best when stacked with Testosterone Propionate or other cutting agents. It is often used toward the end of a cycle to enhance muscle definition.

Is Masteron an aromatase inhibitor?

Masteron does not reduce estrogen levels systemically, but it does exhibit anti-estrogenic properties at the receptor level. While it may reduce the need for AI in mild cycles, it should not replace a true aromatase inhibitor when using aromatizing compounds in higher doses.

Is PCT required after a Masteron cycle?

Yes. Despite being non-aromatizing and relatively mild in side effects, Masteron still suppresses natural testosterone production. A full post-cycle therapy should follow all cycles involving this compound.

Who should use Masteron?

Masteron is ideal for intermediate to advanced users preparing for contests, photo shoots, or cutting cycles. It is not typically used for bulking, as it does not contribute to rapid weight gain or water retention.