front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |18 |19 |20 |21 |22 |23 |24 |25 |26 |27 |28 |29 |30 |31 |32 |review

Vitamin A requirement is ~100-1000 µg/kg body weight/day Greatest need is during rapid growth VAD starts at 4 to 6 M of age Deficiency due to inadequate nutritional intake, frequent disease, malabsorption, diarrhea and febrile infections.