Nandrolone Phenylpropionate actually has a very short half-life of only -day where it is effective in the body. They decided that this short half-life wasn’t really going to be effective for most users since they wouldn’t want to inject themselves so frequently. So the decanoate ester was developed to bind to the hormone, which resulted in Nandrolone Decanoate. This new variant was esterified which gave the hormone a much longer half-life of 15 days. This allowed for much less frequent injections from users and is another major reason as to why this anabolic steroid became so popular. It became more convenient which made more people feel like they could fit it into their normal, everyday schedules.