red urine after vitamin b12 injection Drastic color change in my patients receiving a CyanoKit. : r/mildlyinteresting Discolouration of urine after B12

Reported adverse effects included mild injection site reactions and transient headaches

Are you feeling tired, lethargic or have a mental fog

Hydroxocobalamin is the preferred agent in this patient population (see separate monograph in Less Common Drugs)

However, the oral route cannot be excluded as it did not depend on intrinsic factors only, as the simple diffusion (without the need for intrinsic factors) is now considered another mechanism for the absorption of vitamin B12 [49, 50]

Mood swings may signal low vitamin B12 levels, and in more advanced cases, neurological issues such as tingling, nerve pain, or numbness in the hands and feet can arise from untreated B12 deficiency