S4 was developed in the treatment of muscle wasting diseases with benign prostatic hypertrophy treatment

By binding to the androgen receptors, S4 alters the gene expression, thereby increasing anabolism by increases in protein synthesis. In comparison to its binding affinity it is approximately one third that of*testosterone.
S4 unlike many*other androgens, does not convert to (DHT) and it does not aromatize.*
S4 is not known for being a mass monster, but lean gains be made providing nutrition and caloric intake are being made.
Cutting or a recomp is where i believe s4
shines. S4 will protect your muscle tissue during a calorie deficit.

Research has shown S4 to increase lipolysis (fat loss) . yet it is unclear to what extent . S4 has been shown to increase hardness and definition significantly, especially in someone who is already lean. Hardening and strength effect of s4 are often compared to winny.

Pharmacodynamics of selective androgen receptor modulators. - PubMed - NCBI
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