are vitamin b12 tablets as good as injections vs Pills: Richmond's Complete Guide Why Choose Vitamin B12 Injections

For pre-filled pens or auto-injectors, follow the manufacturer's instructions to prepare the device for injection

The effects of each injection may last several days to weeks, depending on the individuals metabolism and activity level

If you're dose is higher than 1mL, avoid injecting into the upper arm

The first week, adults get 1000 mcg daily

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