YK-11 is a unique selective androgen receptor modulator (SARM) that also functions as a myostatin inhibitor—a dual-action mechanism that sets it apart from other SARMs. Myostatin is a protein that limits muscle growth; by inhibiting it, YK-11 may allow for greater muscle development than typical androgen receptor activation alone.

Structurally based on DHT (dihydrotestosterone), YK-11 binds to androgen receptors and stimulates follistatin production, a natural myostatin-blocking protein. Early research suggests YK-11 may promote significant gains in lean muscle mass, strength, and endurance with relatively low androgenic activity outside of muscle tissue.

How YK-11 Works:

• Binds to androgen receptors to promote anabolic activity

• Inhibits myostatin, allowing for unregulated muscle growth

• Increases follistatin levels to further support hypertrophy

Potential Benefits (Based on Preclinical Research):

• Rapid and significant lean muscle growth

• Increased strength and muscular endurance

• Potential for enhanced muscle definition

• Minimal activity outside of muscle and bone tissue

For Research Use Only. Not for Human Consumption.
This compound is not approved by the FDA or any regulatory body and is intended solely for laboratory research.

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LGD-3303 is a next-generation selective androgen receptor modulator (SARM) structurally related to LGD-4033 but designed with enhanced selectivity and oral bioavailability. It binds strongly to androgen receptors in muscle and bone tissue, triggering anabolic activity while minimizing unwanted side effects in non-target tissues.

Unlike some other SARMs, LGD-3303 also activates Wnt signaling, a pathway associated with bone growth and repair—making it a compound of interest in studies focused on both muscle and skeletal health.

How LGD-3303 Works:

• Selectively binds to androgen receptors in muscle and bone

• Promotes anabolic effects without significant androgenic activity

• Activates Wnt signaling for potential bone density support

Potential Benefits (Based on Preclinical Research):

• Increased lean muscle mass and strength

• Improved bone mineral density

• Faster recovery and enhanced physical performance

• Minimal estrogenic or androgenic side effects

For Research Use Only. Not for Human Consumption.
LGD-3303 is not approved for human or animal use. It is intended solely for laboratory research purposes.

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LGD-4033, also known as Ligandrol or VK5211, is a highly potent selective androgen receptor modulator (SARM) developed to combat muscle wasting and age-related muscle loss. It works by selectively binding to androgen receptors in muscle and bone, delivering muscle-building benefits without the unwanted side effects of traditional anabolic steroids.

In both animal and human research, LGD-4033 has demonstrated a strong anabolic profile, making it a popular subject of study for increasing lean body mass, strength, and recovery rates.

How LGD-4033 Works:

• Binds selectively to androgen receptors in skeletal muscle and bone

• Stimulates anabolic activity without converting to estrogen or DHT

• Supports muscle growth while minimizing androgenic side effects

Potential Benefits (Based on Research):

• Significant increases in lean muscle mass

• Enhanced strength and physical performance

• Improved recovery and endurance

• May help preserve muscle during caloric restriction or injury

For Research Use Only. Not for Human Consumption.
LGD-4033 is not approved for human or veterinary use. It is intended solely for laboratory research purposes.

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S-4, also known as Andarine, is a non-steroidal selective androgen receptor modulator (SARM) originally developed to treat muscle wasting, osteoporosis, and benign prostatic hypertrophy. It binds selectively to androgen receptors in muscle and bone, promoting anabolic activity without significantly affecting other organs.

In research settings, S-4 has shown the ability to support muscle retention during caloric restriction, enhance vascularity, and promote fat loss, making it of interest in body composition studies.

How S-4 Works:

• Selectively activates androgen receptors in muscle and bone tissue

• Promotes anabolic activity without strong androgenic side effects

• May preserve lean muscle during cutting or calorie-deficit phases

Potential Benefits (Based on Preclinical Research):

• Lean muscle growth and retention

• Enhanced fat loss and vascularity

• Improved strength and performance

• Minimal water retention

For Research Use Only. Not for Human Consumption.
S-4 is not approved for human use and is intended solely for laboratory research purposes.

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S-23 is a next-generation selective androgen receptor modulator (SARM) developed to bind with high affinity to androgen receptors in muscle and bone tissue. It has been shown in preclinical studies to be one of the most potent SARMs available, delivering robust anabolic effects while minimizing activity in other tissues.

S-23 is also being explored for its potential application in male hormonal contraception, due to its ability to suppress luteinizing hormone (LH) and follicle-stimulating hormone (FSH) without completely shutting down testosterone production in some models.

How S-23 Works:

• Strong affinity for androgen receptors in muscle and bone

• Encourages lean muscle mass development and strength gains

• Suppresses hormonal pathways related to reproduction (in animal studies)

Potential Benefits (Based on Research):

• Significant increase in lean muscle mass

• Enhanced strength and performance

• May aid in fat reduction during cutting phases

• Investigated for use in male birth control

For Research Use Only. Not for Human Consumption.
S-23 is not approved for human or veterinary use. It is intended solely for laboratory research purposes.

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AC-262536 is a non-steroidal selective androgen receptor modulator (SARM) developed as a potential alternative to traditional anabolic agents. It selectively binds to androgen receptors, promoting muscle growth and anabolic activity while minimizing activity in tissues like the prostate, reducing unwanted androgenic effects.

Although less potent than some other SARMs, AC-262536 has drawn interest in research for its favorable anabolic-to-androgenic ratio and potential applications in muscle wasting conditions.

How AC-262536 Works:

• Selectively binds to androgen receptors in muscle and bone

• Promotes anabolic activity without significant suppression of natural hormones

• Minimizes stimulation of androgenic receptors in non-muscular tissues

Potential Benefits (Based on Preclinical Research):

• Promotes lean muscle gains

• May support improved strength and physical performance

• Lower androgenic side effect profile

• Potential for muscle preservation in calorie-restricted states

For Research Use Only. Not for Human Consumption.
This compound is not approved by the FDA or other regulatory agencies and is intended strictly for laboratory research purposes.

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SR-9009, also known as Stenabolic, is a REV-ERBα agonist, a class of compounds that regulate the expression of genes involved in circadian rhythm, metabolism, and fat storage. By activating REV-ERB, SR-9009 has been shown in animal and in vitro studies to increase mitochondrial function, boost energy expenditure, and reduce fat mass.

Unlike stimulants, SR-9009 works on a cellular level, promoting the body’s ability to burn fat and improve endurance without directly affecting the central nervous system.

How SR-9009 Works:

• Activates REV-ERBα receptors

• Enhances mitochondrial activity in muscle cells

• Regulates genes tied to fat storage and energy balance

Potential Benefits (Based on Preclinical Research):

• Improved endurance and stamina

• Increased fat metabolism and reduced fat storage

• Enhanced energy levels and metabolic rate

• Potential support for lean muscle retention during caloric deficits

For Research Use Only. Not for Human Consumption.
SR-9009 is not approved for human or veterinary use and is intended solely for laboratory research purposes.

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MK-2866, also known as Ostarine or Enobosarm, is a selective androgen receptor modulator (SARM) developed to stimulate anabolic activity in muscle and bone while minimizing unwanted effects in other tissues. It has been extensively researched for its potential to help prevent muscle wasting and improve recovery in clinical and preclinical studies.

How MK-2866 Works:

• Binds selectively to androgen receptors in skeletal muscle

• Activates anabolic pathways to promote lean muscle growth

• Avoids conversion to estrogen or DHT, reducing side effects

Potential Benefits (Based on Research Studies):

• Increases lean muscle mass and strength

• Supports muscle preservation during cutting or injury recovery

• Enhances physical performance and endurance

• May aid in bone density improvement

For Research Use Only. Not for Human Consumption.
This compound is not approved for human use and is intended strictly for laboratory research purposes.

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SR-9011 is a research compound that functions as a REV-ERB agonist, targeting REV-ERBα and REV-ERBβ nuclear receptors. These receptors play a critical role in regulating the body’s internal clock (circadian rhythm), as well as various metabolic and inflammatory processes.

By activating REV-ERB, SR-9011 may influence genes involved in energy expenditure, fat storage, and muscle metabolism—making it a compound of interest in studies related to weight management, endurance, and metabolic disorders.

How SR-9011 Works:

• Activates REV-ERBα/β, which regulates circadian rhythm and metabolism

• Enhances mitochondrial activity and energy utilization

• Reduces the expression of genes linked to fat storage and inflammation

Potential Benefits (Based on Preclinical Research):

• Increased fat burning and weight loss

• Enhanced endurance and stamina

• Improved metabolic rate and energy efficiency

• Potential support for maintaining lean muscle during caloric restriction

For Research Use Only. Not for Human Consumption.
This compound is not approved by regulatory authorities for human use and is intended strictly for laboratory research.

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GW-501516, commonly known as Cardarine, is a peroxisome proliferator-activated receptor delta (PPARδ) agonist developed for its potential effects on metabolic regulation and endurance. Unlike SARMs, GW-501516 works by activating specific gene pathways involved in fat burning and energy metabolism.

How GW-501516 Works:

• Activates PPARδ receptors in muscle tissue

• Promotes the use of fatty acids as the primary energy source

• Enhances oxidative metabolism and increases energy efficiency

Potential Benefits (Based on Preclinical and Animal Research):

• Increased endurance and stamina

• Improved fat loss and metabolic function

• Enhanced recovery and athletic performance

• No reported suppression of natural testosterone

For Research Use Only. Not for Human Consumption.
This compound is not approved by the FDA and is intended strictly for laboratory research purposes.

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