An hour at room temperature is unlikely to cause significant degradation
Now we know that the British National Formulary (BNF), that little booklet that is produced twice a year by the Royal Pharmaceutical Society and the Royal Society of Medicine which acts as a reference for doctors to consult in order to treat patients correctly, used to recommend a 1mg injection of Hydroxocobalamin every month when the injection was introduced at the start of the 1960s
Methylcobalamin formulations also typically appear red, with shade variations primarily related to concentration and excipients rather than the form of B12 used
Start: 2.5 mg once daily to assess tolerance
Cerovecki, T., Bojanic, I., Brcic, L., Radic, B., Vukoja, I., Seiwerth, S., & Sikiric, P
Vasireddi N, Hahamyan H, Salata MJ, Karns M, Calcei JG, Voos JE, Apostolakos JM