Boldex U250 1ml vial, 250mg/ml (Swiss Pharm). Boldenone Undecylenate is a very popular steroid. This steroid is only available legally at a veterinarian clinic. Boldex U250 is a highly anabolic, moderately androgenic steroid. For this very reason, it is typically taken in a stack with other steroids like testosterone if you are on a mass cycle or perhaps with winstrol if you are on a cutting cycle. The main benefit of taking equipoise is that it increases protein synthesis in the muscle cells. This effect is very imilar to what you would experience while taking anavar. Boldex U250 gives you slower but much more high quality gains in muscle as opposed to the normal "quick" muscle gains that you would expect from a testosterone.