I got 300iu yellow tops from a well known place here who says it's tested serum is legit 24.5 ng/ml. I've been getting welts at injection site 8 hours after that last for short periods of time and itch. The first week at 2ius I got nothing but got it the second week when I bumped it up a lil. Searched it and it seems either it's bad or it's a chemical used when shipped that keeps it good. Any advice is appreciated. Thanks.