S4 (Andarine), (25mg/capsule) 60 Capsules

S4 (Andarine, GTx-007) is a propanamide-class non-steroidal selective androgen receptor modulator (SARM) originally developed as a high-affinity androgen receptor (AR) ligand. It functions as a partial agonist at AR and has been characterized by its differential transcriptional activation profile across distinct androgen receptor signaling systems. Experimental investigations have demonstrated selective modulation of AR-mediated gene expression and receptor-cofactor interactions, distinguishing S4 from full androgen receptor agonists. Research applications include androgen receptor pharmacology, AR partial agonism studies, receptor-mediated transcriptional regulation, ligand-receptor interaction analysis, and structure-activity relationship investigations involving non-steroidal SARM scaffolds.