I was looking at some GHK-cu HA serums for my old lady skin and decided I could probably mix up my own for less than pre-mixed. Does anyone have experience DIY'ing this? Any tips or tricks to share? The info I have come across has suggested that 1g mixed into 1oz of serum is a good ratio. I'm not planning on using it for microneedling, just as a daily serum outside of that.