Masterobol -10gm

  • Batch and lot coded with publicly visible lab reports to ensure quality and transparency.
  • Less than 2% variance in concentration, guaranteeing consistency.
  • Formulated and packaged to prevent evaporation in storage.
  • Includes graduated 0.4mL pipette for convenient measurement.
  • Glass bottle with UV resistance to minimize degradation.
  • Tamper-proof seal to ensure safety in transit.

105,00лв. (53.69 €)

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Masterobol – chemical name Drostanozolol– is a legal alternative to the anabolic Prostanozol. Typically used as a muscle hardener and strength increaser, Drostanozol’s unique chemical structure assists in the body’s recovery from heavy weight training and stress. Masterobol has been shown to dramatically sharpen the appearance of the body in those who already carry a lower percentage of body fat.  Users of Masterobol often report their skin taking on an almost paper-thin appearance – an effect that is highly-desired in bodybuilders.

XStreamForce SARMs – MASTEROBOL’s active ingredient YK11, is one of the most advanced SARMs currently available on the market. It is a one of a kind substance that works to inhibit Myostatin while working as a SARM at the same time (Selective Androgen Receptor Modulator). Myostatin is a protein which inhibits and limits muscle growth. Alpha works by binding to Myostatin which allows for one to build muscle beyond their genetic potential.

YK11 induces muscle cells to make more follistatin (more than DHT does) – a strong myostatin inhibitor. With that said, YK11 can be as good as testosterone, without the detrimental side effects.

The other compound in Masterobol is Cardarine. Cardarine works by activating the same pathways that get activated when we conduct cardiovascular exercise. It was originally developed to treat obesity and other metabolic diseases.

Studies have shown Masterobol has the ability to burn fat by increasing glucose uptake in skeletal muscle tissue, which changes the body’s metabolism to burn fat for energy instead of muscle and/or sugars.

Incredibly, it does all this without dropping blood sugar levels and is also completely non-stimulant. In studies Cardarine resulted in test subjects being able to complete increasingly longer exercise sessions while reducing recovery time between sets while also increasing the number of repetitions or movements before reaching exhaustion


* 99% Pure SARMs

* Pharmaceutical grade

* Manufactured in the EU

* Compounded by XStreamForce’s Pharmacologist

* HPLC Tested

* Free International Shipping

* Scientific-backed advice and assistance


These products are not for use in preventing, curing, or treating a particular disease or ailments. Sold for research purposes only. Not sold for human consumption.



A dose of 20mg per day of MASTEROBOL (YK11), (GSK 516) is recommended. Each bottle has 24ml with an average dose being 0.4 ml, which is the capacity of the dropper. Each bottle contains 60+ doses of use. Cycle Length: 8-12 Weeks. Shake well before use.


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To help you get a better idea of how YK11 works; here are its most common health benefits:

  • Increased muscle size. Masterobol may not be a traditional SARM but it can still stimulate muscle growth and produce new muscle cells (by naturally increasing follistatin cells), whilst suppressing myostatin (a protein that stops excessive muscle growth). Numerous users have reported benefiting from 10-15lbs worth of lean muscle mass gains in just one 8-week YK11 cycle.
  • Fat reduction. Alongside encouraging lean muscle mass growth, Masterobol SARM can also cause significant fat losses in a short space of time.
  • Healthier, stronger bones. A key part to keeping your bones healthy is sex hormones. Studies suggest that Masterobol can help to improve your bone strength by binding itself to your androgen receptors. It can also increase the level of activated PKB (protein kinase B) in your cells, resulting in bone growth.
  • Increased strength. The idea of strength moves in an endless cycle, namely because they are so intimately entwined. When it comes to increased strength – as you are able to lift more weight; more muscle fibers will be stimulated.