The problem with this is ph. Combining two vials of say tirz isn’t a big deal because both would be the same ph.
When you start combining blends, they likely won’t have the same ph. Now you mix them and found potentially damage one or the other. I was trying to find all the stuff I was reading about this the other day to post with this but there’s just too many places and I can’t find it again.
Part of the read was talking about how reconning all of the peps in klow separately and then mixing all into a single vial was a no go because of this.