What is S23?
S23 is a nonsteroidal selective androgen receptor modulator (SARM) with high AR binding affinity and strong tissue-selective activity. Among the most potent SARMs, it produces robust anabolic effects in muscle and bone with strong androgenic suppression of the HPG axis (spermatogenesis inhibition at sufficient doses).
Research tool for SARM pharmacology, male contraceptive models, and androgen receptor selectivity studies. Research use only.
Research Applications
High-Affinity SARM Pharmacology AR binding kinetics, agonist efficacy, receptor conformation vs steroidal ligands Male Contraceptive Research FSH/LH suppression, spermatogenesis inhibition, reversibility studies Muscle & Bone Anabolism Anabolic activity in skeletal muscle and bone without prostate stimulation SARM Selectivity Profiling S23 vs other SARMs (LGD-4033, RAD-140, Ostarine) — tissue-specific AR activity HPG Axis Suppression Gonadotropin suppression dynamics, testosterone suppression, recovery timeline
Quick Specs
- Form
- Tablet — 10mg per tablet, 100-tablet bottle
- CAS Number
- 1010396-29-8
- Molecular Formula
- C₁₈H₁₃ClF₄N₂O₃ Molecular Weight 416.8 g/mol
- Compound Type
- Selective Androgen Receptor Modulator (SARM)
- Purity
- ≥99% by HPLC — every batch
- Identity
- MS molecular weight confirmed — every batch
- COA
- Janoshik-independent, publicly verifiable
- Manufacture
- In-house synthesis — Qingdao, China
- Storage
- Room temperature sealed | cool, dry storage
- Shelf Life
- 24 months unopened
Frequently Asked Questions
How are Vesta research tablets supplied?
Vesta research tablets are supplied as pre-dosed oral tablets at the stated concentration.
No reconstitution is required. Each tablet is compressed at uniform dose for consistent dosing in research applications. How should research tablets be stored?
Store at room temperature (15–25°C) in a cool, dry place away from moisture, heat, and direct sunlight.
Keep in the original container. Properly stored tablets remain stable for 2–3 years. What purity are Vesta research tablets and how is it verified?
Vesta research tablets contain active ingredient at ≥99% HPLC purity before tableting, with MS-confirmed identity on every batch. COA is published on the product page and independently verifiable at verify.janoshik.com. Peptide Research Tools: Use Vesta’s free peptide calculators — reconstitution, BAC water, dosing, half-life, and mixing charts.
International shipping: 7–14 days