Compare · SARM
S23 vs YK-11
Both are sarm compounds. Here's how they line up on the evidence — graded the same way.
| S23 | YK-11 | |
|---|---|---|
| Evidence | 3/10 | 3/10 |
| Class | SARM | SARM |
| Summary | S23 is a synthetic selective androgen receptor modulator (SARM) — not a peptide — studied only in rodents as a male contraceptive candidate. There are no human trials, and it is an unapproved drug banned in sport. | YK-11 is a synthetic steroidal SARM marketed for muscle growth, but its claimed human benefits rest entirely on cell-culture data — there are no human trials, and it is an unapproved drug banned in sport. |
| Full profile → | Full profile → |
S23
S23 is a lab-made drug in a family called SARMs (selective androgen receptor modulators — molecules that switch on the same cell "docking points" as testosterone, but only in certain tissues). It is not a peptide. The idea behind it was to build up muscle and bone while having relatively little…
YK-11
YK-11 is a lab-made compound sold as a SARM (selective androgen receptor modulator — a drug designed to switch on the body's muscle-building signals) and pitched as a way to add muscle. The marketing aside, it is not a peptide. It is a steroid-style molecule built on a 19-norandrostane backbone (a…