Deca duraboline is an anabolic steroid
Now a days they are being used to build muscles within a short span of time.
But it's long time use has been associated with many side effects like Hypertension
, Peptic ulcer
, Diabetes, etc.
So...it will be my advice to avoid using steroids for building muscles.
Best method is to do regular exercise & have a healthy diet rich in proteins.
Wishing you a good health.
Thanks & take care.