I believe after this, if a e-juice vendor won't tell a customer where it gets it's nic from, that would be a vendor I would not use.
Telling where they get their nic from does not disclose their "flavor" recipes and it should not be a problem for them to disclose this nic information.
JMO.
ETA: This seriously reinforces my personal desire to go nic-less as soon as possible. Zero nic. I have a ways to go to ween off, but it is a goal more now then ever.
You can do it! I did.
Stuff like this makes me glad I gave up nic.
Seriously, stuff like this is going to get our hobby banned. How many people will go back to analogs if nicotine sales in the mail gets banned by the FDA because of crap like this?