Depends where your injecting and how much fat you have ... if 1" makes the muscle belly your fine , personaly i use 1.5 for sust and olny shot it in my glute due to the prop content and sust is know to freeze up the lower limb of alot of guys . Quad injections are out of the question for me when it comes to sust ..... !!
Sust for me is not a site injecting option , but primo is and some claim localized growth from it .