Anyone have reaction to liquid sublingual B-12?

I normally use GNC B-12 sublingual tablets, but I found a liquid B-12 and wanted to try it. I used it just like the directions said (One dropper full, hold under tongue for 30 seconds, then swallow). About 2 minutes later I had a horrible feeling in my stomach and felt nausaus(sp) then after a few minutes I started to get a rash. Almost my whole body was covered with this red rash that was hot and itchy. It went away about an hour or two later and now I feel fine. Obviously I am switching back to my GNC sublingual tablets but I am curious if this has happened to anyone else and why?

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