Im on deca for the first time in my life at 38 yo. im realy feeling it work around 1 month.besides a bloated face its a very friendly compound. I just feel good. cardio has improved and workout recovery is fast. I can even move my fingers faster playing guitar( this is a half joke)seriously though I feel like I have improved reflexes with the fast twitch muscle. Dont know if its really the deca but I am quite happy with this compound