I've seen some charts that show how the compound is active in the blood (obv I didn't do the sTudy but it seemed legit) and it showed every other day injecting to yield stable blood levels. From what I understand, stable blood levels= less sides. I injected eod, test blend, and I did glutes and delts, quads once but never again...pip was manageable after a while (oops, post injection pain<--) in delts and glutes after I got steady handed and made sure I was injecting deep enough