Sorry I didn't see this till now....I didn't experience any issues that I can tell, I used two amps in one inj. This is my first experience with EO in over 25 years of juicing, It went in so quick and smooth that I thought they were fakes....haha, but apparently that's how eo is supposed to be, didn't even feel any soreness in the inj site that I would normally feel with other gear.... there's no question though about quality, these amps are awesome and definitely pharma, based on my experience with other pharma and UGL's! I didn't get them from this source, but since he has experience with retesto in india I wanted his opinion about authenticity....
I'll be injecting again tomorrow, will let you know if I have any issues.... What problems do you experience with EO?