It may be possible, but I bet its one of the solvents u are mixing them with instead. Thats usually the case, never heard of anyone itching over hormones or peptides.
I had the same reaction when a nurse gave me an antibiotic which somehow I became allergic to. I had taken it many times in my younger days (as directed by a licensed DR or RN) whenever I got certain illness'. It never bothered me before but all of a sudden I started itching within an hour or 2 of the first dose.
Only way to stop the allergic reaction is to take Benadryl internally as well as rub Hydrocortisone cream on any bad spots externally.
oh yeah, and switch solvents or solutes