I was wondering the same but some people say you are dulling the needles a bit by going into two vials then yourself and also ph/compatibility, contamination risks increase. Most recommend doing it separate in different spots from what I've seen and pin glow closer to the injury if that's why you are taking it. Someone can correct me if I'm wrong. I decided to avoid extra risks.
Glow + Reta mixing
Can Glow and Reta be mixed in one syringe so reduce nightly pins? They already reconstituted separately. I'm sure it's been answered before, but I probably missed it with info overload lately.