This is something that i have been playing with in recent weeks. I purchased some pure CBD isolate from Phytodabs. They provide batch lab reports from a reputable lab.
The mix i made was was with one of my recipes, Simple Custard. Creating a high VG product is next to impossible as the CBD will recrystallize so my blend was a 200mg/30ml bottle in a 60VG/40PG solution. Here is what i did.
I mixed, from base, my flavoring and PG. I then added 200mg CBD crystal and let it sit for about 30 minutes to make sure the CBD dissolved. Next i added the VG and shook the hell out of it and let it sit overnight. I have seen products in the 1000mg/30ml bottle range but i believe the key to this is the PEG400, which i dont have and the 200mg product i made works well for me.
This worked out well but it is a little light on CBD/mg. I dont use it by itself, for me this is used when i need a little bit of a boost as in i need a bit more pain relief. I also use the Hemp Classic like from Bluebird Botanicals @ 10mg-20mg/day. It is a full spectrum product meaning that it contains other helpful cannabinoids and a bit of THC as well, in the .03 - .04% range.
Ive been using CBD for quite awhile now, what we are seeing in the CBD community parallels what we saw in the ejuice world in the beginning. A few good vendors are starting to float to the top in a sea of bad. Both Bluebird and Phyto are excellent products.
Id be happy to answer any questions that i can.