S23 (SARM)
Selective Androgen Receptor Modulator
£45.00
What’s Included
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60 capsules per bottle -
10mg pure S23 per capsule
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2-month supply (1 cap daily)
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Third-party lab certificate included
Lab Tested
Third-party verified
Fast Shipping
3-7 business days
24/7 Support
Expert guidance
Product details
Buy S23 UK: CORE supplies S23 in the UK as 60 x 10mg capsules, third-party lab tested, with the certificate included.
S23 SARM is one of the most potent SARMs available, known for its exceptional ability to promote lean muscle growth while simultaneously supporting fat loss. Originally developed for muscle-wasting conditions, S23 has become the choice for experienced users seeking dramatic body recomposition.
Our premium S23 SARM is manufactured to pharmaceutical standards and undergoes rigorous third-party testing. Each capsule contains 10mg of pure S23, delivering powerful anabolic effects with minimal side effects when used responsibly.
S-23 – A SARM for the Most Experienced Users
S-23 is among the strongest SARMs, providing both extreme lean muscle mass building and fat loss potential in pre-clinical studies.[1] This means that it may provide high potential gains, but also requires careful monitoring – it is a SARM for experienced users.
Reaping the potential benefits requires establishing a clear monitoring framework, as well as post-cycle therapy (PCT) following intake. Less experienced users might opt for other lean muscle-building SARMs available at CORE SARMS.
Active Ingredients
Purity & Quality
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Third-party lab tested -
99.2%+ purity guaranteed -
24-month shelf life
S23 SARM works by binding to androgen receptors with high affinity and selectivity, particularly in muscle and bone tissue. This selective binding promotes strong anabolic effects while minimizing unwanted side effects in other tissues.
The compound increases protein synthesis and nitrogen retention while simultaneously supporting fat oxidation, making it ideal for body recomposition goals. S23’s unique properties allow users to build lean muscle while losing fat, creating a harder, more defined physique.
With a half-life of 12 hours, S23 SARM provides sustained anabolic support when taken twice daily, making it highly effective for experienced users.
Key Actions
S-23 is one of the most potent SARMs available, which is also why it carries the strongest suppression on this list. If you’re weighing it up as a first compound, read our Complete Beginner’s Guide to SARMs first.
Real results from real customers
Transformations from verified customers. Individual results vary.
Reviews
Rated 4.9 by verified UK buyers.
What are the Key Benefits of S23 (SARM)?
Lean muscle gains
Enhanced strength
Accelerated fat loss
Improved muscle hardness
Better vascularity
Enhanced recovery
How to Use S23 (SARM)?
Dosage
10mg once daily
Timing
Take with morning meal
Cycle Length
6-8 weeks followed by 4-week break
Important
Dietary supplement use only
Recommended for experienced users only. Start with lower doses to assess tolerance.
Training
Combine strength work with higher-intensity sessions to hold onto muscle while fat comes off.
Diet
Eat at a 300–500 calorie deficit with very high protein. Watch your sleep quality too, since S-23 can disrupt rest.
Stacking and cycle guidance
S-23 fits into advanced cutting protocols depending on your research goals. Pick a single companion below to stack with S-23 and save 5%:
Cardarine (GW501516) + S23 (SARM)
Cutting: Cardarine's endurance and fat-burning support round out S-23's aggressive cutting effect.
£90.25 £95.00 Save 5%
S-23 10-20mg each morning. Cardarine 5-10mg, 1-2 hours before training. Run together for 6 weeks. PCT mandatory after.
RAD 140 (Testolone) + S23 (SARM)
Advanced recomposition: RAD-140 adds lean mass support to offset the aggressive cut S-23 drives.
£90.25 £95.00 Save 5%
S-23 10-20mg + RAD-140 5-15mg, both once daily each morning. Run together for 6 weeks. PCT mandatory after.
MK 677 (Ibutamoren) + S23 (SARM)
Recovery: MK-677 supports recovery and sleep quality during S-23's aggressive cutting cycle.
£88.35 £93.00 Save 5%
S-23 10-20mg each morning. MK-677 10-25mg, 30-60 minutes before bed. Run together for 6 weeks. PCT mandatory after.
The CORE SARMS Handbook walks through dosing, cycle length, and stacking logic for every compound on this page.
Read the CORE SARMs Handbook →Post-cycle support
Frequently Asked Questions
Contact supportS23 is a potent, selective androgen receptor modulator designed for advanced users seeking significant muscle growth and fat loss.
S23 is recommended for experienced users who have completed cycles with milder SARMs like Ostarine or Ligandrol first.
Users typically experience significant lean muscle gains, enhanced strength, improved muscle hardness, and accelerated fat loss.
Potential effects include testosterone suppression, mild fatigue, or temporary mood changes. Side effects vary with dose and cycle length.
S23 can be stacked with other SARMs, but due to its potency, careful consideration of dosages and cycle length is important.
S23 is a powerful Selective Androgen Receptor Modulator (SARM) designed to increase lean muscle mass, strength, and endurance while helping reduce body fat. It’s considered one of the most potent SARMs available, known for delivering visible muscle hardening and performance improvements within a short period.
S23 is commonly used to enhance muscle growth, boost strength, and improve body composition. Many advanced fitness enthusiasts and athletes use it for cutting or recomposition phases, as it helps preserve lean muscle while promoting fat loss and definition.
S23 works by binding strongly to androgen receptors in muscle and bone tissue, stimulating protein synthesis and muscle development. Unlike anabolic steroids, it acts selectively, focusing on muscle-building benefits while minimizing unwanted effects on other organs or tissues.
Most users begin to see results within 2–3 weeks, with noticeable improvements in muscle definition, strength, and endurance as the cycle progresses. Optimal results are usually achieved after 6-8 weeks of consistent use, combined with proper diet and training.
The recommended dose is 10 mg once daily. However, due to its potency, start with lower doses and monitor your intake throughout the cycle to ensure safety and efficacy. After a 6-8 week cycle, follow up with a post-cycle therapy.
Looking for something else?
Are you looking for products that support recovery and healing? Explore other options and see Ostarine (MK-2866) available at CORE SARMS.
Related products
References:
- Jones, A., Chen, J., Hwang, D. J., Miller, D. D., & Dalton, J. T. (2009). Preclinical characterization of a (S)-N-(4-cyano-3-trifluoromethyl-phenyl)-3-(3-fluoro, 4-chlorophenoxy)-2-hydroxy-2-methyl-propanamide: a selective androgen receptor modulator for hormonal male contraception. Endocrinology, 150(1), 385–395. https://doi.org/10.1210/en.2008-0674
