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
M., & Khavinson, V
Some reviews of IV glutathione for skin lightening have noted liver dysfunction in some patients
Ning D, Yang X, Wang T, Jiang Q, Yu J, Wang D
Notably, N-homocysteinylated proteins formed by N-linkage of the carboxyl group of homocysteine with the E-amino group of lysine residues of proteins may be considered neo-antigen formation, thereby inducing the destruction of melanocytes by CD8 + T cell-mediated autoimmune reactions (92)
PMID: 31484368