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Research Pharma S-4 Pro (Andarine) is a Selective Androgen Receptor Modulator (SARM) that does not have androgenic activity in non-skeletal-muscle tissues. The physiological effects of S-4 on research subjects include increased density and hardening of muscle fibre tissue, fat oxidisation and nutrient partitioning. The compound has a mild effect on estrogen levels.

  • 25mg x 60 Research Pellets
  • Absorb Core base to improve bioavailability and extend the half-life
  • Piperine 5mg for improved absorption
  • Potent hardening agent for maximum definition
  • S-4 is one of the most researched SARMs in the industry
  • Increases lean muscle mass gain
  • Preserves lean muscle during a dieting phase
  • Increases oxidation of fatty tissue
  • Doesn’t cause liver damage
  • No aromatization

The Pro version of SR-9009 contains an “Absorb Core” base to improve bioavailability and to extend the half-life of the compound, making it one of the strongest and most efficient on the Research Compound market.

What is S-4?

Initially developed in order to combat conditions such as Osteoporosis or as prevention for muscle wastage, S4 is one of the most researched SARMs at present.

However, it has recently been shown to yield surprising results in clinical trials. It not only increased muscle mass and calcium production for increased bone density but it did so in a selective manner.

When applied to humans, this means it is able to selectively stimulate anabolic activity allowing the user to surpass any of the nasty side effects associated with products of similar potency.

S-4 is described as an Androgen Receptor (AR) agonist. This means that it has a significant affinity/potency for binding to the AR in order to stimulate the production of useful genes. For example, the anabolic genes that benefit muscle growth. S4 is also capable of desensitizing the AR to natural testosterone supplies, meaning the effect of taking S4 is increased even further.

Results to Expect from Research Pharma S-4 Pro

Andarine (S4) is a highly versatile and exciting SARM that is able to selectively generate anabolic activity in the human body. It has shown to increase lean muscle tissue while simultaneously reducing body fat.

This compound was designed for the treatment of conditions such as muscle wasting, osteoporosis and benign prostatic hypertrophy. This makes S-4 an ideal candidate compound if your research is based around either muscle tissue hardening, fat oxidisation and bone density.

Physiological improvements of test subjects are considered very dry with zero water retention and a substantial improvement in the density of muscle fibre tissue.

Andarine has been through human trials but no studies were published. There is some limited information which suggests that S-4 was described as the ideal SARM due to its single-day dosing, complete oral bioavailability and significant anabolic effects.

When to Use Research Pharma S-4

One of the major benefits of Research Pharma S-4 Pro is its ability to give the ‘chiselled’, sharp look all bodybuilders seek to achieve. It really shows its efficacy during cutting phases, with users able to still put on mass despite being in a calorie deficit.

Some say that S-4 will give similar, if not better, effects than steroids such as Anavar.

However, it can also provide a major boost while in a bulking phase to accelerate muscle gains while mitigating fat gain. If you are a bodybuilder wanting to sculpt a world-class physique, this is your ultimate SARM.

Who can Use Research Pharma S-4 Pro?

Both men and women can use S-4 as it is both non-aromatizing (for men) and does not cause excessively masculine features in female users.

How to Use Andarine (S-4)

Administer 50 mg per day split into 25mg am and 25mg pm.

Recommended administration length is 8-12 weeks.

Research Pharma S-4 Pro is slightly suppressive so a light PCT is required for test subjects following administration of a course of this Compound.

Do NOT exceed the recommended administration dosages in any 24 hour period.

Andarine (S-4) Side Effects

S-4 can induce negative ocular conditions (yellow vision and light sensitivity) in some research subjects. To avoid this it is recommended to administer this compound on a 5 day on, 2 days off protocol and no more than 50mg per day.

Due to its selective nature, S4 does not cause gynecomastia or liver damage and causes very minimal growth on secondary sexual organs (eg. prostate). It also exhibits:

  • 0% chance of aromatization and no rise in female characteristics during the post-cycle period
  • Larger increases in muscle mass than DHT
  • An ability to be used by females without excessive masculine features
  • No heart enlargement or damage to organs
  • No diminishing of testosterone during the post-cycle period

Research Pharma S-4 Pro Contents

S-4 25mg x 60 Research Pellets
Pellet weight 166mg +/-5%

Contents per pellet:
Andarine 25mg
Piperine 5mg
Naringin 12.5mg
DiCalcium Phosphate 60mg

Binder: Microcrystalline Cellulose
Blue colouring
White colouring

Additional information




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