DECA needs to be ran longer than 12 weeks typically and should be limited to people on TRT as it will take a very very long time to recover from. HPTA will be suppressed for 12 to 18 months.
Test will be your most anabolic safe option.
Mast and Primo are your next 2 options for safe things to add. EQ being the final option but has some minor sides like anxiety issues and a carcinogen as it is not intended for human consumption.
Mast won’t add a ton of muscle but will make you feel amazing, strength gains and look very dry and vascular. Will cause hair loss if you’re prone.
Primo can be taken at massive dosages and doesn’t seem to have a drop off in efficacy like test and some other drugs do. Makes you look, dry, lean and full as well as some vascularity. It is only 12% less anabolic than test and a 400 test/ 600 primo combo would be great. However, it is very pricey.