I noticed some GHK-cu HA serums while shopping for my aging skin, and it occurred to me that whipping up a batch myself would likely cost less than buying a ready-made product. Has anyone here tried making this on their own? I'd welcome any advice or pointers. From what I've read so far, a ratio of 1g to 1oz of serum seems to be recommended. My intention isn't to use it with microneedling — I just want it as an everyday serum separate from that.