An injection is a medical procedure, and what youre putting into your body has to be the right stuff, at the right dose
Centers for Medicare and Medicaid Services
Your body does not make vitamin B12 on its own, so you have to get it from outside sources
Macrocytic anemia occurs when your body doesnt have enough normal red blood cells, and can cause symptoms including muscle weakness and paresthesias (paresthesias is the technical term for the pins and needles feeling on your skin)
Older adults are more likely to have a vitamin B12 deficiency because they're prone to not having enough hydrochloric acid in their stomachs
Some of the signs of lower B12 levels in your body include: Pale or yellow-tinged skin Weakness and fatigue Balance and coordination are affected A sensation of pins and needles Mouth ulcers Blurred or disturbed vision On rare occasions, high temperature Mood changes Rani MD Treatment of vitamin B12 deficiency often includes dietary changes, B12 shots, or supplements