From the book: Anabolics 2000
Dynabol is an Australian steroid, containing the unique compound nandrolone cypionate. This drug is only produced in Australia as a veterinary product and is rarely seen here in the United States. It is very similar in effect to Deca-Durabolin, allowing a slow release of the mild steroid nandrolone. The primary difference here is that cypionate will only sustain a notable release for about two weeks. Deca on the other hand is active in the body for up to one month. The shorter duration should not be looked to as an unfavorable characteristic however. In this case it produces an extremely interesting steroid. Blood levels will peak much faster, and gains will probably accumulate in a shorter time frame. This is supported by the fact that many bodybuilders in Australia swear Dynabol is one of the most favorable nandrolone preparations, often said to provide a stronger "kick" than Deca-Durabolin.