Excellent timing on this thread. I was just looking around for advice on the same topic. I don’t know if it is the needles, the GHK-cu, or something else but my skin seems to not want to let needles through anymore. Even pinching, the skin gets pushed down by the needle point.
I’ve been prepping a wider area and poking around a little for a good spot lately. But I am going to try a slight jab instead to see if that works better.
Might also see about moving from 30g to 31g, but putting 20 units through the 30g is already so slow.