Nandrolone Decanoate is notorious for causing major shut down during a steroid cycle. Its always recommended using Pregnyl (HCG) during the cycle and during the PCT to help with proper recovery. A mistake many people make is starting a PCT too early when using Deca, the half-life of this steroid is around 14 days, this does not mean you should start the PCT after 14 days, you should wait till the levels are low enough in your system. A steroid PCT calculator such as this one is what you should use to make sure you start your PCT on time. Deca Durabolin can also cause significant issues with libido especially with low levels of Testosterone in your body, and if you are using Testosterone Cypionate, it is recommended that you stop the Deca 1 or 2 weeks before the Test Cyp to ensure your Testosterone levels are high enough while the Deca is still in your body.
The are many different post cycle options out there, which one you choose will depend on a few factors such as the dosages taken and the length of time the cycle was.
Testosterone Cypionate 500mg for 12 weeks
Deca 300mg for ten weeks
Pregnyl 500iu twice a week
This cycle is mild compared to some other cycles, and a moderate pct will be needed. Since Pregnyl was used during the cycle, it will help with recovery. A pct consisting of 50mg Clomid and 20mg Nolvadex for four weeks should suffice. Blood tests should be taken a week after the PCT to see if your body has adequately recovered, if not then you should consider doing some research an completing another PCT.
If you are worried about the shut down that Deca causes then instead opt for a different Steroid such as Equipoise which is used by many people as an alternative to Deca. Another option is NPP (nandrolone phenylpropionate) which is a fast acting version of Deca which seems to be very popular for a few reasons, there is less water retention, shut down appears to be far less, and there are reports out there that it helps reduce fat.