Athletic animals which exercise regularly and strenuously have B-Group vitamin requirements far in excess of their less athletic counterparts
Studies indicate possible nootropic effects through enhanced cellular energy metabolism, improved mitochondrial function, and reduced oxidative stress
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
Nutrition experts have not established a tolerable upper intake level for vitamin B12 (the maximum safe amount per day)
Alternatively, oral capsules are available but have significantly lower bioavailability
PMID:29155147 Babula JJ, et al
