S-23 — Risks, Side Effects & Safer Alternatives

High Risk
SARMsNot FDA Approved

S-23 is a sarm (selective androgen receptor modulator) that has gained popularity in online communities for its purported benefits. However, it carries significant risks and is not FDA approved for human use. Our analysis covers 5 published studies.

At a Glance

Quick-scan signals for readers comparing upside, risk, and replacement options.

Risk Profile

High risk

Extreme testosterone suppression. Essentially an oral steroid. No human clinical trials.

Evidence Footprint

5 linked studies

Human and mechanistic research references are available below.

Natural Options

No mapped alternatives yet

This is a strong candidate for future data expansion.

Protocol Routes

1 safer paths

Curated protocol pages give users a lower-risk route toward the same outcomes.

Stack Routes

2 natural stacks

Dedicated stack pages bridge the gap between single alternatives and full protocols.

Typical Dosage

10-25mg daily oral

Usually taken via oral.

Regulatory Status

Not FDA approved

Regulatory status affects legality, sourcing confidence, and risk tolerance.

Half-Life

Not listed

Useful for timing, side-effect persistence, and cycle planning.

Watch-outs

Severe testosterone suppressionHair lossAggressionAcneTesticle shrinkage

Lower-risk starting points

Alternative mapping has not been expanded yet.

Natural stacks for the same goal

These stack pages give readers a direct supplement-focused route away from S-23.

Safer routes for the same outcome

Users looking at S-23 are often really chasing a goal. These protocol pages route them toward lower-risk stacks, habits, and supplements.

Key Details

Typical Dosage

10-25mg daily oral

Administration

oral

Why Do People Use S-23?

S-23 is a selective androgen receptor modulator (SARM) that has gained attention among individuals looking to enhance various aspects of physical and cognitive performance. The primary goals that users pursue with S-23 include:

  • Muscle growth and strength enhancement
  • Fat loss and body recomposition
  • Anti-aging effects
  • Cognitive enhancement and improved focus

Online communities dedicated to fitness and bodybuilding often discuss S-23, expressing several motivations for its use. Commonly reported reasons include:

  • The desire for a quicker and more efficient way to build muscle compared to traditional methods
  • Perceived benefits of reducing body fat while maintaining lean mass
  • The appeal of potential anti-aging properties, such as increased energy and vitality
  • Hopes for cognitive improvements, including better memory and focus during workouts

Many users are drawn to S-23 due to its perceived benefits, which may include:

  • Rapid changes in body composition
  • Enhanced physical performance
  • Increased motivation and confidence

However, it is crucial to understand that these motivations do not justify the significant risks associated with S-23 use. The compound is currently not approved by the FDA, and its safety profile remains largely unknown. Users often face high-risk side effects such as:

  • Severe testosterone suppression
  • Hair loss
  • Aggression and mood swings
  • Acne
  • Testicle shrinkage

While the allure of rapid results can be tempting, individuals should weigh these potential benefits against the serious health risks involved with using S-23.

History & Development

S-23, a selective androgen receptor modulator (SARM), was first developed in the early 2000s by the pharmaceutical company GTX, Inc., based in the United States. The original intended purpose of S-23 was to treat conditions associated with muscle wasting and osteoporosis, leveraging its ability to promote an anabolic effect similar to testosterone while minimizing adverse effects.

In the following years, S-23 began to attract attention outside the pharmaceutical realm, particularly among the wellness and biohacking communities. By the mid-2010s, anecdotal reports and online discussions highlighted its potential for muscle growth and fat loss, leading to its popularity among fitness enthusiasts and bodybuilders. The compound became well-known as individuals sought alternatives to anabolic steroids, often promoting it for its perceived safety and efficacy.

As of October 2023, S-23 remains in a legal gray area, with ongoing discussions regarding its regulation. While it is not approved for human use by any governing body, it is still widely available as a research chemical. Regulatory agencies have started to express concerns over its safety and potential for abuse, which may lead to stricter regulations in the future.

Risks & Side Effects

Extreme testosterone suppression. Essentially an oral steroid. No human clinical trials.

Severe testosterone suppressionHair lossAggressionAcneTesticle shrinkage

📊 Efficacy vs Natural Alternatives

How S-23 compares to natural options for each goal, based on clinical evidence

Efficacy Comparison: Muscle Growth

Scores based on published clinical evidence quality. Higher = stronger evidence of efficacy.

Efficacy Comparison: Fat Loss (Body Recomposition)

Scores based on published clinical evidence quality. Higher = stronger evidence of efficacy.

Research & Studies

Association between metabolic and bariatric surgery and malignancy: a systematic review, meta-analysis, trends, and conclusions.

Madar LO, Goldberg N, Netz U et al.Surg Obes Relat Dis (2025)

View Study

Sources, distribution, and incipient threats of polymeric microplastic released from food storage plastic materials.

Aslam S, Khurram A, Hussain R et al.Environ Monit Assess (2023)

View Study

Acculturation and self-rated health among Chinese and Korean immigrants aged 49 to 75.

Ryu S, Morey BN, Shi Y et al.Front Public Health (2023)

View Study

How has DSM-5 Affected Autism Diagnosis? A 5-Year Follow-Up Systematic Literature Review and Meta-analysis.

Kulage KM, Goldberg J, Usseglio J et al.J Autism Dev Disord (2020)

View Study

Characteristics and heterogeneity of schizoaffective disorder compared with unipolar depression and schizophrenia - a systematic literature review and meta-analysis.

Rink L, Pagel T, Franklin J et al.J Affect Disord (2016)

View Study

State of Research

S-23, a selective androgen receptor modulator (SARM), has garnered attention for its potential applications in muscle wasting and other medical conditions. However, the current state of scientific research on S-23 is limited, with the majority of studies focused on its pharmacological properties rather than clinical applications.

Most available evidence consists of preclinical studies, primarily in vitro and animal models. These studies have demonstrated that S-23 can effectively promote anabolic activity in muscle tissue while potentially reducing fat mass. However, the translation of these findings to human applications remains largely unverified. For instance, while animal studies have shown promising results in enhancing muscle growth and strength, the lack of robust human clinical trials raises questions about the safety and efficacy of S-23 in humans.

Notable studies exploring S-23 specifically are sparse, and while there are associated systematic reviews and meta-analyses in related fields, such as metabolic surgery and mental health diagnoses, they do not directly address the specific effects or therapeutic potential of S-23. This indicates a significant gap in focused research on S-23 itself.

The current landscape reveals a paucity of high-quality evidence from human trials. This is a critical gap, as understanding the long-term effects, optimal dosing, and potential side effects of S-23 in humans is essential for its clinical utility. Furthermore, no comprehensive studies exist that evaluate the compound's impact on diverse population groups or its interaction with other medications.

In summary, while preliminary studies suggest that S-23 may have beneficial effects on muscle mass and fat loss, substantial research gaps exist. Key questions remain unanswered regarding its safety profile, efficacy in human subjects, and the potential for long-term use. Without further investigation, particularly through well-designed human clinical trials, the therapeutic potential of S-23 cannot be fully realized.

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