S23 is one of the strongest SARMs in the Biaxol line‑up and is targeted at very advanced users. It’s typically used in short, focused cycles when the goal is dense muscle, strength and a harder look. Because of its potency, S23 is never a beginner compound and demands proper support and planning.
- Extremely potent SARM for advanced users
- Aimed at dense lean muscle and strength
- Often used in aggressive cutting phases
- Requires serious cycle support and PCT
- Not recommended for beginners at all
How it works
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Strongly binds to androgen receptors in muscle, driving powerful anabolic signalling.
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Helps increase protein synthesis and nitrogen retention in lean tissue.
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Can influence strength, hardness and overall body‑composition during intense phases.
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High receptor activity also means more suppression, so recovery planning is critical.
Benefits
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Extremely strong lean‑mass support
Used when experienced lifters want clear changes in size, density and performance over a short period.
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Helps create a hard, dry physique
Often chosen for cutting or pre‑photo phases where muscle detail and tightness are the main goal.
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Big strength and performance push
Users commonly report heavier lifts, more reps and a more aggressive training output while on‑cycle.
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Pairs with serious cycle support
Designed to be run only alongside robust liver, lipid and general health support products and bloodwork.
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Used in advanced stacks only
Typically appears in the stacks of seasoned athletes who already know how they respond to milder SARMs.
Dosage and Safety
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S23 is a high‑potency experimental SARM, not an approved medicine or dietary supplement.
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Human long‑term safety data are limited.
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It can significantly suppress natural testosterone and may influence liver enzymes, blood lipids and cardiovascular markers.
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Any use should occur only under medical supervision, with regular bloodwork, full cycle support and structured PCT.
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Not for people with an existing health condition or comorbidities.
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Always consult a physician before considering experimental substances.
Ingredients
Component
Dose per Serving
%DV
S23
10 mg
*
Black Pepper Fruit Extract (Piper nigrum)
5 mg
*
Vegetable capsule (HPMC)
—
*
*Daily Value (DV) not established.
Used Together
Helps protect liver function when running a very strong SARM like S23, supporting healthy enzyme values throughout the cycle.
Broader antioxidant and organ support to help manage androgen‑related stress on lipids, blood pressure and general health markers.
Often used alongside S23 to support endurance and fat‑loss, helping maintain conditioning while strength and hardness increase.
A milder SARM that some advanced users keep for later phases or bridging, when they want support with a lower overall load.
FAQ
Is S23 suitable for beginners?
No, S23 is one of the harshest SARMs and is strongly suppressive to natural hormones. It belongs only in the hands of experienced users who already know how they respond to milder compounds, and who are prepared to run full support and proper post‑cycle therapy with medical oversight.
Does S23 require PCT after the cycle?
Yes, because S23 significantly suppresses natural testosterone, a structured post‑cycle therapy is strongly advised after use. Many advanced athletes combine PCT blends with bloodwork to track recovery. Skipping PCT can leave hormones low, training poor and overall health compromised for a long time.
Can I stack S23 with other SARMs?
Most users avoid stacking S23 with other SARMs because total androgen load becomes very high. If it appears in a protocol, it usually replaces lighter compounds, not sits on top of them. Stacking should only be considered with medical guidance and full health monitoring.
What side effects are associated with S23?
Reported issues include heavy suppression of natural testosterone, mood and libido changes, possible hair and skin effects, and strain on cardiovascular and liver markers. Because there are no long‑term human trials, unknown risks may exist. Anyone noticing worrying symptoms should stop use and consult a doctor immediately.
9 reviews for S23
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Perfecto 👍 S23 hace lo que promete
March 31, 2026 -
Salve, qual è il migliore SARMS.e come si usa. Grazie mille
June 9, 2024 -
This product is top-notch. S23 has significantly improved my strength, endurance, and muscle definition. A 5-star supplement!
June 5, 2024Verified Review -
I’ve tried many supplements, but S23 stands out. Remarkable strength gains and no adverse effects. Excellent product!
June 5, 2024Verified Review -
This product is fantastic. S23 has boosted my strength and endurance like never before. A must-have for serious fitness enthusiasts.
June 5, 2024Verified Review
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So happy it worked well for you!
Biaxol team