This decyanation process is demanding: Although the amount of cyanide is considered toxicologically insignificant, humans must remove and detoxify the cyanide molecule, reduce the cobalamin to its usable +1 oxidation state, and then enzymatically convert the cobalamin into one of two metabolically active coenzyme forms
Pale or Jaundiced Skin A lack of B12 can interfere with the production of healthy red blood cells and may cause the skin to look pale
You can inject both on the same day at different sites without issue
Human body needs various vitamins such as vitamin A, B, C, and D etc., for different functions including effective vision, nerve function, immunity, and bones health respectively
[1] [2] This rapidly replenishes depleted B12 stores and corrects anaemia
Regarding supplementing with B12, you have two main options: B12 Pills vs B12 Shots