That's an interesting theory. Now I'm curious if any of the Indian pharma HCG might have similar preservatives, meaning it keeps better than the UGL generics.
I'll see if there's any literature about whether there's anything in Pregnyl besides the HCG
Edit: looks like just sodium phosphate.
PREGNYL® (chorionic gonadotropin) for injection is a sterile, dried powder for intramuscular injection after reconstitution.
Each multiple-dose vial is only for use in one patient and contains 10,000 USP units of chorionic gonadotropin with dibasic sodium phosphate (4.4 mg) and monobasic sodium phosphate (5 mg). If required, pH is adjusted with sodium hydroxide and/or phosphoric acid.
Each package also contains a 10-mL vial of solvent containing: water for injection with 0.56% sodium chloride and 0.9% BENZYL ALCOHOL (preservative), WHICH IS NOT FOR USE IN NEWBORNS. If required, pH is adjusted with sodium hydroxide and/or hydrochloric acid