By Inside Your Peptides · Originally published · Language revised 2026-09-17
Body-composition scans can change with water, fat and other tissues. A change in lean mass does not by itself demonstrate stronger or larger skeletal muscle, and findings cannot be transferred between different compounds.
Check what lean mass means
Lean mass is a measurement category, not a synonym for skeletal muscle. Water and other tissues can contribute to a scan result. Ask whether the study measured muscle size, strength or physical function directly, rather than treating a scan change as proof of all three.
Keep each compound and population separate
An outcome for one drug in one population does not establish the effect of another molecule or a combination. Hormone changes, body-composition changes and clinical benefit are different endpoints. A mechanism is a research rationale, not a treatment verdict.
A better evidence summary
For each claim, record the exact compound, studied population, comparator, measured endpoint, follow-up and limitations. This revised explainer withholds the legacy compound grades until the underlying studies are reviewed. It does not recommend personal use, combinations or a supplier.
Educational reading only. This page does not provide medical, dosing or personal-use guidance.