https://www.ncbi.nlm.nih.gov/pubmedhealth/PM... Vitamin B12 https://www.ncbi.nlm.nih.gov/pubmedhealth/PMHT0022013/ https://www.ncbi.nlm.nih.gov/pubmedhealth/PMHT0022013/ https://www.ncbi.nlm.nih.gov/pubmedhealth/PM... Whole body operational health https://www.ncbi.nlm.nih.gov/pubmedhealth/PMHT0022013/ http://www.ncbi.nlm.nih.gov/pubmedhealth/PMHT0022013/ https://www.ncbi.nlm.nih.gov/pubmedhealth/PM...