(Comprehensive review detailing the inter-related roles of B-complex vitamins in cellular metabolism, energy production, and neurological function)
Low levels of B12 are associated with issues such as anxiety, depression, and cognitive decline
The outer thigh has fewer nerves and blood vessels, which helps reduce the discomfort associated with the injection
The clinically approved dosage is 1.4 mg administered once daily
Patients frequently report an energy change in the first day or two, which is most plausibly B12 in deficient patients, and expectation in everyone else
Eggs : One large egg provides approximately 0.6 micrograms of B12, primarily in the yolk