Beta-carotene: spinach and other dark leafy greens; broccoli, deep orange fruits (apricots, cantaloupe) and vegetables (squash, carrots, sweet potatoes, pumpkin)
Deficiency Disease for Vitamin A
Hypovitaminosis A
Deficiency Symptoms for Vitamin A
Night blindness, corneal drying (xerosis), triangular gray spots on eye (Bitot's spots), softening of the cornea (keratomalacia), and corneal degeneration and blindness (xerophthalmia); impaired immunity (infectious diseases); plugging of hair follicles with keratin, forming white lumps (hyperkeratosis)
Toxicity Disease for Vitamin A
Hypervitaminosis A
Chronic Toxicity Symptoms for Vitamin A
Increased activity of osteoclasts causing reduced bone density; liver abnormalities; birth defects
ergocalciferol (vitamin D₂): vitamin D derived from plants in the diet and made from the yeast and plant sterol ergosterol
cholecalciferol (vitamin D3 or calciol): vitamin D derived from animals in the diet or made in the skin from 7-dehydrocholesterol, a precursor of cholesterol, with the help of sunlight
calcidiol (25-hydroxyvitamin D): vitamin D found in the blood that is made from the hydroxylation of cholecalciferol in the liver
calcitriol (1,25-dihydroxyvitamin D): vitamin D that is made from the hydroxylation of calcidiol in the kidneys; the biologically active hormone, sometimes called active vitamin D
Vitamin D
Mineralization of bones (raises blood calcium and phosphorus by increasing absorption from digestive tract, withdrawing calcium from bones, stimulating retention by kidneys)
Significant Sources of Vitamin D
Synthesized in the body with the help of sunlight; fortified milk, margarine, butter, juices, cereals, and chocolate mixes; veal, beef, egg yolks, liver, fatty fish (herring, salmon, sardines) and their oils
Deficiency Diseases for Vitamin D
Rickets, osteomalacia
Deficiency Symptoms for Vitamin D
Rickets in Children: Inadequate calcification, resulting in misshapen bones (bowing of legs); enlargement of ends of long bones (knees, wrists); deformities of ribs (bowed, with beads or knobs); a delayed closing of fontanel, resulting in rapid enlargement of head; lax muscles resulting in protrusion of abdomen; muscle spasms
Osteomalacia or Osteoporosis in Adults: Loss of calcium, resulting in soft, flexible, brittle, and deformed bones; progressive weakness; pain in pelvis, lower back, and legs
Toxicity Disease for Vitamin D
Hypervitaminosis D
Toxicity Symptoms for Vitamin D
Elevated blood calcium; calcification of soft tissues (blood vessels, kidneys, heart, lungs, tissues around joints)
Vitamin E
Alpha-tocopherol
Vitamin E
Antioxidant (stabilization of cell membranes, regulation of oxidation reactions, protection of polyunsaturated fatty acids [PUFA] and vitamin A)
Synthesis of blood-clotting proteins and bone proteins
Significant Sources of Vitamin K
Bacterial synthesis in the digestive tract; a liver; leafy green vegetables, cabbage-type vegetables; milk
Vitamin K needs cannot be met from bacterial synthesis alone; however, it is a potentially important source in the small intestine, where absorption efficiency ranges from 40 to 70 percent
There are no known toxicity symptoms for Vitamin K