Boldenone Undecylenate is a long-ester injectable derivative of testosterone, originally developed for veterinary use under the brand name Equipoise. Chemically, it is testosterone with a 1,2 double bond that significantly reduces aromatization. The undecylenate ester gives it an estimated 14-day half-life, supporting weekly or twice-weekly injections.



The compound is associated with slow, steady, lean mass gains over longer cycle lengths — 12 to 16 weeks is typical at 400 to 600mg per week. Because aromatization is mild, water retention is limited, and gains tend to retain better post-cycle than from heavier-aromatizing compounds. Boldenone also has a well-documented appetite-stimulating effect that aids in mass-building phases.



A specific watch-out is that Boldenone increases red blood cell production noticeably, which can elevate hematocrit and blood viscosity. Bloodwork during the cycle is recommended, and blood donation or therapeutic phlebotomy is sometimes needed on long runs. Otherwise the side-effect profile is relatively mild for a steroid of its potency.



Strength: 4/6

Muscle Gain: 6/6

Fat/Water Loss: 1/6

Keep Gains: 4/6

Side Effects: 1/6