If you let it go for too long, it can cause problems in your nervous system such as: Vision problems Memory loss A pricking or numbing sensation Difficulty speaking or walking due to ataxia (loss of physical coordination) Damage to your extremities (hands, feet, arms, etc.), particularly your legs Other problems could include Infertility (this should go away with B12 treatment) Stomach cancer Bleeding and infections Damage your heart, brain, bones, and other organs in your body If you're pregnant and don't get enough vitamin B12, your baby is at risk of a serious birth defect called a neural tube defect
You will see B12 reactions described online as a healing crisis or the body releasing stored toxins
So if you're on a vegan or vegetarian diet where you're not eating foods from animals, you're at risk for B12 deficiency
With a fresh, unused syringe, pull back on the plunger to the amount you are injecting, bringing air into the syringe
Any alternative text (alt text) provided alongside figures in this article has been generated by Frontiers with the support of artificial intelligence and reasonable efforts have been made to ensure accuracy, including review by the authors wherever possible
Please also download and read this step-by-step guide leaflet