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S23 10


S23 stands out as one of the most potent and effective SARMs (Selective Androgen Receptor Modulators) available in the market. The benefits associated with S23 include: Increased muscle mass, enhanced strength, fat loss, improved endurance, reduced recovery times.


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S23 10

Known names: S-23, Andarine S23, SARM S23, C18H13ClF4N2O3, S23 Selective Androgen Receptor Modulator, 1010396-29-8, S23 SARM, S23 Nonsteroidal Androgen Receptor Agonist, S23 Androgen Receptor Ligand.


S23 stands out as one of the most potent and effective SARMs (Selective Androgen Receptor Modulators) available in the market. Following S23, another notable SARM is YK11.

This compound was developed by modifying the chemical structure of a substance known as C-6. S23 represents an enhanced version of C-6, offering superior bioavailability and binding affinity.

S23 boasts an impressive bioavailability of up to 96% and demonstrates one of the highest binding affinities among all SARMs, comparable to LGD-4033.

As a full agonist of the androgen receptor, S23 shares the distinction of being the only SARM, alongside LGD-4033, to possess this property.

It’s important to note that S23 exhibits significant suppressive effects on testosterone levels, similar to traditional steroids.

Furthermore, extensive testing on rats has revealed that S23 is so powerful that it caused infertility in every subject it was administered to.

How Does S23 Function?

Similar to anabolic steroids, S23 operates by targeting androgen receptors in muscle tissue. However, SARMs such as S23 are selective in their action, exclusively affecting muscle tissue and avoiding side effects on receptors in the prostate.

This means that S23 and other SARMs deliver comparable benefits to steroids with fewer associated side effects. Although SARMs are generally less potent than steroids, S23 stands out as a particularly strong compound, often likened to the power of steroids. Notably, S23 and YK11 are considered the most potent SARMs currently available.

Benefits of S23

It is crucial to highlight that S23 is still undergoing research and lacks extensive study compared to more established SARMs like Ostarine or LGD-4033, which are considered safer options.

The benefits associated with S23 include:

  1. Increased muscle mass
  2. Enhanced strength
  3. Fat loss
  4. Improved endurance
  5. Reduced recovery times

Now, let’s delve into each benefit individually to provide a detailed explanation.

Increased Muscle Mass

S23 has garnered attention for its ability to generate significant muscle gains. The effectiveness of S23 in promoting muscle growth can rival that of potent steroids. Some consider S23 as a unique hybrid between SARMs and steroids. However, we strongly advise against using this compound if you are a beginner, as it can place excessive strain on your body.

Remember, training and nutrition remain paramount. While S23 is potent, proper training and diet are prerequisites for optimal results. It’s worth noting that discontinuing training after the cycle may result in significant loss of gains.

Enhanced Strength

Another notable benefit of S23 is its capacity to increase strength. Users often report remarkable strength gains, surpassing previous personal records. Week after week, they experience progressive improvements, achieving 50lbs or more on major lifts such as the bench press, deadlift, and squat.

Retaining such strength gains may prove challenging, but with consistent post-cycle training and proper strategies, it’s possible to maintain a significant portion of the acquired strength.

Fat Loss

S23 promotes fat loss, although not as effectively as compounds like Stenabolic or Cardarine. Nonetheless, it contributes to simultaneous muscle gain and fat reduction. Even on a slight caloric surplus, users may experience fat loss.

Additionally, individuals often notice enhanced vascularity and longer-lasting pumps during their S23 cycles.

Improved Endurance and Reduced Recovery Times

S23 provides some degree of endurance improvement, albeit less potent than other compounds. Users can work out for longer durations and require fewer breaks between sets.

Users also report increased stamina in the bedroom, which aligns with ongoing research exploring S23 as a potential male contraceptive.

S23 reduces recovery times, allowing for faster recuperation after intense training sessions. While typical recovery time after a rigorous gym session is 72 hours, S23 users report recovery periods of less than a day. This enables more frequent and intense workouts, leading to better overall results.

S23 Side Effects

Testosterone Suppression

S23 significantly suppresses natural testosterone production, as do all SARMs. However, S23 exhibits a more pronounced suppression compared to other SARMs. Although most SARMs do not typically require a post-cycle therapy (PCT), S23 and possibly YK11 are exceptions.

Due to its potency, S23 necessitates a longer recovery period after the cycle. This can result in side effects such as brain fog and mood disturbances stemming from suppressed testosterone. To avoid the need for a PCT, it’s advisable to keep S23 dosages very low. Alternatively, consider exploring alternative SARM options for a safer approach.

Increased Aggression

While S23 doesn’t induce roid rage like traditional steroids, users often experience heightened aggression similar to the irritability associated with RAD 140. Managing this side effect involves recognizing its presence and understanding that your reactions may be exaggerated. It’s also important to be mindful of your interactions with others, as increased aggression may affect interpersonal relationships.

Night Sweats

S23 can cause nighttime dehydration, so it’s essential to maintain proper hydration by keeping water nearby. Failure to do so can lead to additional side effects like cramps, headaches, and fatigue. Night sweats occur because S23 elevates the body’s metabolic rate, resulting in thermogenesis. Waking up drenched in sweat is a common occurrence while using S23, and if this side effect emerges, reducing the dosage is recommended.

Hair Shedding

Androgenic compounds generally lead to some degree of hair shedding. Given S23’s potency, hair shedding can progress to hair loss if not managed carefully. I personally recommend using RU-58841 during an S23 cycle, as it helps prevent hair loss and strengthens hair follicles against the androgenic effects of S23.

Dosage and Cycle Length

We recommend starting with a daily dosage of 5mg and gradually increasing based on your response, up to a maximum of 15mg per day. Since S23 has a half-life of 12 hours, it’s advisable to split the daily dosage into two administrations, one in the morning and the other in the evening. For example, a recommended cycle would involve taking 2.5mg in the morning and 2.5mg in the evening over an 8-week period.

Exceeding an 8-week cycle is not recommended.

S23 Results

Before discussing the promising results, it’s important to address a common experience reported by men, namely temporary infertility while using S23. While some may find this concerning, others appreciate the temporary relief from contraception during intercourse. Rest assured, this effect of S23 is transient in nature.

The anticipated results are highly promising. In an eight-week cycle, users can expect to gain approximately 15 to 20 pounds of muscle mass. Strength gains will be significant, with most personal records shattered by the fourth week.

Additionally, reduced recovery times associated with S23 allow individuals to enjoy their gym sessions to a greater extent, facilitating a quicker return to training.

Lastly, users can anticipate a 5% reduction in total body fat over a two-month period with minimal effort beyond adhering strictly to diet and exercise routines.

S23 vs. Steroids

In terms of strength, S23 is comparable to most steroids, provided a proper PCT is followed to mitigate side effects. However, it’s important to note that S23 is still undergoing comprehensive research, and its potential side effects remain less understood.

The most common steroid that S23 is compared to is Winstrol, as they exhibit similar effects within the body. Surprisingly, on a milligram-to-milligram basis, S23 surpasses Winstrol in terms of potency.

Considering its potency, S23 should be approached with caution and used responsibly to avoid potential side effects, which will be addressed in the following section.


S23 is the only SARM, and possibly YK11 as well, for which I recommend a post-cycle therapy (PCT).

This recommendation stems from the potent and powerful nature of S23. A four-week PCT with Clomid is suggested at the conclusion of your cycle.

For a comprehensive guide on how to execute a proper PCT with Clomid, I recommend visiting this link.

If you prefer to forgo a PCT, it is advisable to limit the dosage to a maximum of 5mg.


In conclusion, S23 is an exceptionally potent SARM that can deliver remarkable results. However, it’s crucial to acknowledge that this compound is still undergoing research, which poses a significant limitation. There may be undiscovered side effects associated with S23. Therefore, I strongly recommend exploring other SARMs that have undergone more extensive research, such as Ostarine and LGD-4033, before considering S23.

To avoid the need for a post-cycle therapy, it is crucial to administer S23 in very low doses.


1 Box of 2x 25Tablets, 10mg per Tablet.


Keep the product stored below 30°C.
Protect it from light exposure and avoid freezing.

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