Wanted to bump this as there are more products coming out using Mig 812 and 840. I know there are significant differenced between them, but
@MindlessWork do you recall what compound you were injecting with the Mig840? I only ask because I had a similar experience when trying injectable anadrol for the first time. It thought it was a Mig840 allergy / reaction, but it turned out that the anadrol was actually crashed (couldn't see it with naked eye), and when I warmed it up properly before injecting, the injection site reactions ceased. So, the redness / swelling was actually due to inflammation from the non-dissolved crystals and not the Mig840 itself.