Well, having been through a couple of knee surgeries and ankle issues over the years i notice the hydraulic pressure build up from deca fairly early. The synovial fluid build-up makes me feel 20 years younger once it is up and running full-tilt. Nothing makes me feel bulletproof like deca. By bulletproof i mean i can take the safeties off squatting and deadlifting. Throw caution to the wind so to speak. I have taken nothing else that even comes close, including eq.