Nandrolone vs Trenbolone

Nandrolone (A-tier) vs Trenbolone (F-tier). mechanism, trials, evidence boundaries, dosing literature. side-by-side reference.

Nandrolone · tier A

Deca and NPP are injectable nandrolone esters. People seek them for mass, strength, and joint comfort, but those three claims do not have the same evidence.

The muscle effect is real. A bodybuilder trial increased fat-free mass 2.6 kg, and a 20-trial meta-analysis found a smaller pooled lean-tissue gain. Strength was inconsistent, fat loss was not demonstrated, and joint repair remains an anecdotal claim.

+2.6 kg fat-free mass in an 8-week bodybuilder RCT · half-life decanoate apparent terminal half-life 7 to 12 days in humans; phenylpropionate has a different, shorter absorption profile · androgens

Trenbolone · tier F

Trenbolone is a 19-nor anabolic-androgenic steroid used underground, usually as an injectable product labeled acetate or enanthate, for muscle, strength, recomposition, and a harder or drier look. Current US approval is only for cattle ear implants.

Trenbolone increased muscle and bone measures and reduced fat in rats. People report using it for muscle, strength, recomposition, and a harder look, but no controlled human study has measured those outcomes or dehydration. The human evidence supports concern, not a quantified physique benefit.

0 controlled human physique trials in the reviewed record · half-life no measured human half-life; cattle free-parent disappearance about 1.5 hours after intravenous radiolabeled acetate · androgens

at a glance

• Nandrolone: tier A · +2.6 kg fat-free mass in an 8-week bodybuilder RCT
• Trenbolone: tier F · 0 controlled human physique trials in the reviewed record

reptides grades the research record and cites the literature behind every call. research reference only; not medical advice.