changes in perception including an impaired sense of smell, sensation of pain and paresthesia (skin tingling and numbness, among others
If storage is sub-optimal (room temperature, high humidity, light exposure), expect significantly shorter viability (perhaps only several months for powder, or days for solution)
Dispose of the needle properly (in a sharps container, and not in your regular garbage return it to the docs office or a biohazard collection site!) After the B12 shot is injected into your upper arm, thigh, hip, or butt, you should experience benefits right away
Nutritional deficiencies: Nutrient deficiencies (such as iodine, zinc, vitamin D, or iron deficiency) may trigger hypothyroidism or autoimmunity