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Vitamin B12 for vision A rare condition from a lack of vitamin B12 is optic neuropathy

Deficiency in vitamin B12 is also associated with disproportionate fetal growth (low muscle mass and excess fat mass), increased insulin resistance, intrauterine growth restriction, and lifelong susceptibility to certain chronic diseases

These neurotransmitters play a significant role in mood regulation

Deficiency of carboxylesterase 1/esterase-x results in obesity, hepatic steatosis, and hyperlipidemia

They are also shown to be used for the treatment of cancer, as well as in the treatment of cystic fibrosis, rheumatoid arthritis, acne, and psoriasis