Trenbolone
Muscle & Strength · Injectable 19-nor steroid (~5x androgen activity)
Tier C
What this is
Not approved for human use anywhere. Consistently rated by bodybuilders as the harshest AAS for side effects despite strong results. Distinct cardiovascular and renal toxicity beyond what's seen with other AAS. Home-brewed from cattle implants in older illicit markets. Very high Benefit reflects striking anabolic/body-composition effects; very low Safety reflects severe harm potential.
Mechanism
19-nor derivative; ~5x AR binding affinity vs testosterone; does not aromatize; progestogenic; increases IGF-1 locally; veterinary compound (Finaplix cattle pellets)
Dose & route
Illicit: acetate 50-100 mg EOD; enanthate 200-400 mg/week
Citations
- https://pubmed.ncbi.nlm.nih.gov/23896813/
- https://pubmed.ncbi.nlm.nih.gov/29752847/
- https://pubmed.ncbi.nlm.nih.gov/31422540/
- https://www.ncbi.nlm.nih.gov/books/NBK482418/
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This is an independent synthesis of published research by a non-clinician. Scores are opinions supported by citations, not prescriptions. See the full disclaimer and methodology for how this score was produced and what it does and doesn't mean.