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About Us

Performance Clinics are World's premium quality sports research product suppliers. Our products are the highest quality / purity on the market, produced in the most sophisticated and highly regulated US facilities available and tested by World's most trusted quality assurance analysts with quality reports available on request.

We provide research only products to our clients and ensure access to the best quality product at a fraction of the price available to research specialists elsewhere. Please read our product usage disclaimer before deciding whether or not our products are suitable for your research project.

SARMS S4 (Mass)


in stock



Product name: S4 or Andarine

Short name: Mass

Molecular Formula: C19H18F3N3O6

Concentration: 25mg/ml

Volume: 30ml

S4 is said to be one of the most potent and effective SARMS for sustaining lean muscle mass while stimulating fat elimination at the same time. It is a highly unique product in that it enables users to both build muscle and strip fat at the same time.

When compared to traditional anabolic steroids and injectables such as testosterone, Andarine S4 can produce comparable results without the side effects.

Key Benefits:

  • Builds lean muscle mass
  • Stimulates fat elimination
  • Strength enhancer
  • Vascularity enhancer
  • High potency and quality
  • Cleaner pumps during workouts
  • Little to no side effects


S4 Mass Formula comes in a 30ml bottle at 25mg/ml so 1ml equals 25mg. Typically, one will start between 25mg and 50mg per day so 1 – 2 drops (or 1 – 2ml) depending on desired results.

Note: All PC International products are for research purposes only. No statements made on this website or blog have been evaluated by your local or international administrative or regulatory body as our products are strictly for research purposes only. All products for sale are intended for laboratory and research use. All buyers must be a minimum of 18 years to purchase these products. These products are not intended to treat, cure or prevent any disease or illness. Please refer to our product use and disclaimer for more information.

About Us

Performance Clinics are World’s premium quality sports research product suppliers.

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