Nandrolone can cause weird side effects for some. It has like 3 different mechanisms of lowering libido.
1.) Elevated prolactin
2.) DHN displacing/blocking DHT
3.) Changes to serotonin and dopamine receptors in the brain.
Some people get depression and lowered sex drive for years after nandrolone even if their bloodwork looks perfect with high test, normal estrogen, normal prolactin etc. This is because nandrolone can cause lasting damage to your brain chemistry. It happens with other 19nors too.
https://dopinglinkki.fi/en/info-ban...ic-steroids-cause-long-standing-changes-brain
As for me I don't get 'deca dick' but I do get depression and paranoia/insecurity from nandrolone.
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proviron cures the true deca dick which is caused by the DHN. It would also help with the other two kinds I listed there.