Beware of synthetic supplements esp B12

I have been having LPR symptoms ( mostly breathlessness) on and off for about 7 months , and somewhere in my reading I read that it could be caused due to vitamin deficiency. So I started taking many vitamin supplements, including B12.
Then somewhere along the way , my LPR symptoms got overtaken by anxiety and panic.
Having read on many sites that Anxiety is a subsequent result of breathlessness, I did not pay much attention to it, until I recently read ( bless whatsapp) that synthetic B12 supplements contain cyanide, which can cause bad side effects. So I checked and indeed found stated on the bottle that my B12 supplement was made from Cyanocobalamin..which is a synthetic compound containing cyanide. I immediately stopped taking it, and have been feeling no anxiety or queasiness since then. Even LPR symptoms seem to have improved, although I still take other LPR related OTC such as Limonene/Gaviscon-Adv/Eosophaegal Guardian.

So please check you supplements , and make sure you use only "natural" supplements or don't use at all.

sanmay