Low levels of vitamin D are associated with schizophrenia, bipolar disorder Alzheimer’s disease and Parkinson’s disease. Vitamin D is a fat soluble vitamin. Bile acids are required for fat absorption. Taurocholic acid is a bile acid that is a conjugation of cholic acid with taurine. Taurochenodeoxycholic acid is a bile acid formed in the liver by conjugation of chenodeoxycholic acid with taurine. Taurine increases absorption of vitamin D.
There are low levels of vitamin D in schizophrenia, bipolar disorder, Alzheimer’s disease and Parkinson’s disease due to dysregulation of taurine synthesis in these illnesses attendant on dysregulation of the transsulfuration pathway which synthesizes L-cysteine from which taurine is synthesized.
Supplementation with vitamin D in these illnesses heretofore has not helped much as difficulties in fat absorption have not been addressed. Taurine, which regulates calcium homeostasis besides aiding in fat absorption, calcium hydroxyapatite and vitamin D are required to address low levels of vitamin D where there are also chronic illnesses.