Trenbolone

Trenbolone is a 19-nortestosterone derivative and the most potent anabolic-androgenic steroid in common use, with an anabolic rating of 500 and androgenic rating of 500 (compared to testosterone's 100/100). Originally developed as a veterinary product (Finaplix) for cattle, it has never been approved for human use but is widely used in the performance and body composition optimization communities. Trenbolone's effects on body composition are unmatched — it simultaneously promotes muscle growth, fat loss, and dramatic improvements in nutrient partitioning (the body's ability to direct calories toward muscle rather than fat). It does not aromatize to estrogen but can cause progesterone-related side effects. It binds to androgen receptors approximately 5x more strongly than testosterone. However, trenbolone carries the most significant side effect profile of any commonly used anabolic compound.

It is included in this database for educational completeness, but its use requires serious consideration of the risk-benefit ratio. Side effects can include severe insomnia, cardiovascular strain, neurological effects, and kidney stress. It is generally not recommended in longevity-focused protocols due to its health impact.