Compare · SARM
Ostarine vs S23
Both are sarm compounds. Here's how they line up on the evidence — graded the same way.
| Ostarine | S23 | |
|---|---|---|
| Evidence | Preliminary human | Animal only |
| Class | SARM | SARM |
| Summary | Ostarine is an investigational selective androgen receptor modulator (SARM) — not a peptide — with real but limited human evidence for lean-mass effects, no regulatory approval anywhere, and documented liver-injury and hormone-suppression signals. | 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. |
| Full profile → | Full profile → |
Ostarine
Ostarine (MK-2866 / enobosarm) is a selective androgen receptor modulator that is frequently — and incorrectly — sold on the gray market as a "safer steroid alternative" for muscle building. It is not a peptide and not a dietary-supplement ingredient. There is genuine human evidence that it raises…
S23
S23 is a synthetic selective androgen receptor modulator (SARM) — explicitly not a peptide — that binds the androgen receptor and acts as a tissue-selective agonist, aiming for anabolic effects in muscle and bone with relatively less prostate/seminal activity. It was designed as a male…