Dynabolon is a very unique nandrolone ester. It is produced only in Italy and France and has a reputation of being slightly more potent than the other nandrolones. Each ampule contains 80.5mg of nandrolone undecanoate, in 1ml oil. It has a shorter life in the body than Deca, thus athletes generally opt to inject this product twice weekly to keep blood levels more even. There are counterfeit version of this, but as of yet are only loose ampules. A boxed Dynabolon with insert and sealed ampule tray should be legitimate.  This product does make it to the U.S. black market, but not very often.