Hi everyone, with help from another B12 support website I sourced acetic acid free B12, it's Cobalin H Hydroxocabalamin. A woman who advised of this gets it free via her GP, it's the one her practice uses for everyone. I have interstitial cystitis where I have to avoid all acids, so a very valid reason to request the acetic acid free one. I have been asked to pay £10 for 5 ampules. I admit to being annoyed as i'm already funding my thyroid medication.