Ok so I have two types of cyp one is a home brew at 250mgs/ml and the other is pharmaceutical at 300mg/ml My home brew crashed and I just used the pharm cyp for a week because I didn't want to re-heat and was in a hurry. When I inject the home brew it hurts for maybe a day after, just sore. But when I inject the pharm stuff it hurts for a week. For instance I injected tuesday and friday evening my tuesday inject I can still feel faintly but my friday inject is really sore. What could the differences be ??? I mean i'm not worried just puzzled .