295 In the index

S-40503 S-40503

An experimental bone-focused muscle-building compound developed by a Japanese drug company, studied only in animals for osteoporosis-related use. It has no published human trial history, consistent with a compound that stayed in early development.

Also known as S40503

Effects Build muscle

Routes Oral

Legal status Research chemical

WADA Banned at all times

3D Molecular Structure of C₁₅H₂₃N₃O₃

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Chemistry

Formula: C15H23N3O3
Molar mass: 293.36
CAS: 404920-28-1
PubChem CID: 57398987

Reported dosing

User-reported

What has been reported in the literature and by users. This is a record of what is done, not a recommendation.

Typical dose Not established

Reported range Forum reports: 10-20 mg/day

Route Oral

Frequency Once daily

Duration 6-8 week cycles (unregulated use)

An early Japanese-developed SARM candidate with very limited published data; sold only as a research chemical with dosing derived from forums, not clinical data.

Where this comes from User-reported/research-chemical vendor literature; early-stage pharma data only

There is no approved human dosing for this compound. The figures above are what users and vendors report, not what has been established as safe or effective. Treat them as a record of what is done, not as guidance.