We use cyanocobalamin by default, the form of B12 with the longest clinical history, the most extensive research support, and the consistent potency needed for repeated treatments
Doctors teach patients how to give themselves Vitamin B12 injections correctly
In case of intake deficiency or food-cobalamin malabsorption, we can recommend 1,000 g (1 mg) per day of oral cyanocobalamin for 1 month and then 125 to 1,000 g (0.125 to 1 mg) per day, until the cobalamin deficiency cause is corrected
[1] If the solution is drawn into a syringe for injection, it should be administered promptly for the same reason (avoid leaving the filled syringe exposed to light for long)
As new ingredients emerge in the wellness space, new types of functional beverages are emerging as well