Androgens
Methyltrienolone
Also called R1881, a laboratory androgen-receptor ligand whose research use should not be mistaken for a clinical safety endorsement.
Human-derived cell experiment; historical toxicity record with limited accessible detail; evidence checked 2026-10-01
Also known as: R1881 · Metribolone
Practical use
Evidence interpretation and concrete review questions
- Identify where exposure occurred
- Distinguish cultured cells from treated participants.
- Read the measured layer
- Gene expression, protein abundance and pathway activation are separate.
- Demand accessible safety evidence
- Do not turn a historical title into an unsupported numerical claim.
R1881 in granulosa-lutein cells
Overview
Methyltrienolone is a synthetic steroid used to probe androgen-receptor signaling. It is chemically distinct from trenbolone. Human cells in a dish can help identify a mechanism without exposing the patient to the test compound.
Risks and limitations
A historical human paper specifically investigated liver toxicity. Its accessible record lacks the detail needed for a reliable numerical risk summary, so this guide does not invent a toxicity rate or safe threshold.
How to read this
The important distinction is between a research reagent, a human-cell experiment and a medicine with demonstrated patient outcomes.
Research explained
R1881 in granulosa-lutein cells
Who was studied
Cells obtained from 20 women undergoing ovarian stimulation, then cultured and exposed to R1881 and pathway-blocking comparators.
What was found
R1881 affected expression of AKT-related genes, but androgen-receptor expression and total/phosphorylated AKT did not significantly differ across groups.
What it cannot establish
Exposure occurred in cultured cells, not by treating the women. Gene expression is not proof of improved fertility or clinical efficacy.
Read the original studyHuman-derived does not mean administered to humans
The women supplied cells; the experimental steroid was added later in culture.
Supporting sourceKeep inaccessible toxicity detail explicit
The 1966 liver-toxicity record is traceable, but its metadata alone cannot justify a percentage or potency ranking.
Supporting sourceClaims versus findings
Incorrect
Use in a human-cell laboratory establishes a safe human medicine.
Research reagents can be useful precisely because they perturb signaling; safety requires separate evidence.
Check the evidenceCommon questions
Is R1881 simply another name for trenbolone?
No. The methylated identity is distinct.
SourceSources
R1881 in granulosa-lutein cells
PubChem chemical identity; checked October 1, 2026
Additional primary or official source
Sources checked 2026-10-01.
General education; not a personal treatment plan.