I dont think I would believe that, now 50% or less will see a small redness around spot of injection for awhile due to it being 192, but you will build an anti body pretty quick, only did it to me for about 1 day, otherwise works the same. I have stock of jino and fintropin, used jino's in the past, using kexing right now, dont see a diff
What ever works for each individual. The 191 -vs- 191 amino chain debate is the same as the human -vs- animal grade gear. Go with what you are comfortable with!