Vitamin A

• Funtion?
• Deficiency Syndrom?

• constituent of rhodopsin and other light receptor pigments. also used in growth and development of epithelial, nervous, and bone tissue
• Child: xerosis, keratomalacia, growth failure, death
• Adult: night blindness, xerodermia

Vitamin A

• Toxicity?
• Sources?

• Hypervitaminoses A- headache, naseau, dizziness, skin sloughing, bone pain
• highly pigmented vegetables and fortified margarine

Vitamin D

• function?
• Deficiency syndrome? 
• Toxicity?
• sources?

• major hormonal regulator of bone calcium
• Rickets in chilren, Osteomalacia in adults
• Hypervitaminosis D- hypercalcemia, hypercalcuria, nephrocalcinosis
• Fortified milk, sunlight on skin

Vitamin E

• Function
• Deficiency Syndrome
• toxicity
• sources

• Unknown, serves as antioxidant
• anemia in premature infants, no known for adults
• undefined. megadose can cause headache and dizziness
• vegetable seed oils

Vitamin K

• Function
• Deficiency syndrome
• toxicity
• sources

• Activates blood clotting factors II, VII, IX, and X
• hemorrhagic disease in newborns. defective blood clotting in adults.
• hemolytic anemia, liver damage
• synthesized by intestinal bacteria