does injectable vitamin b12 need to be refrigerated B-12 for Horses, Dogs and Cats — Jeffers Sublingual B12 vs. B12 Injections:

Better Mood Regulation: Adequate B12 levels are linked to improved mood and reduced risk of depression

Hydroxy B12 shots, though less effective, are safer, as this disease can get worse in those with high methylcobalamin levels

However, oral vitamin B 12 can be absorbed passively independent of intrinsic factor

Exercise programming: Resistance training 3-5x weekly to maintain muscle mass during fat loss, moderate-intensity cardiovascular activity to enhance fat oxidation, and potentially fasted morning cardio to leverage elevated free fatty acids from AOD-9604 administration

Post-reconstitution, ensure the vial is sealed tightly, labeled with the date of mixing, and handled with sterile technique to maintain peptide integrity

Although your doctor may put aside their concerns if/when you explain that you have been supplementing with vitamin B12, it's not outside the realm of reason that your doctor may still want to bring you in to rule out serious illness