Overview vitamin algorithm Examples login to view 4 more bullets Characteristics login to view 5 more bullets Vitamin A (Retinol) Function login to view 13 more bullets Source login to view 5 more bullets Deficiency login to view 13 more bullets Excess login to view 17 more bullets Vitamin D Function login to view 12 more bullets Source login to view 21 more bullets Deficiency login to view 10 more bullets Excess login to view 10 more bullets Vitamin E (α-tocopherol) Function login to view 4 more bullets Deficiency login to view 9 more bullets Excess login to view 2 more bullets Vitamin K Function login to view 10 more bullets Source login to view 3 more bullets Deficiency login to view 12 more bullets Excess login to view 3 more bullets