I do sust once a week now, I can't read the info posted above but sust is a mix of different test ester so kicks in quick and then on other end of scale takes 2 weeks to fully enter and 2 weeks to clear, if your happy with your sust then stay on it, I was going 750ml e5d but now every Sunday, morning as I have some me time, only noticed side effects are less visible, eg blood pressure, rage, sex drive and spots, I am not a big guy either just toned, this is only my experience and not advice, need to find what works for you. Also the medi grade stuff is better, I am a lot firmer/harder after switching