Final answer:
Vitamin A toxicity, or hypervitaminosis A, includes symptoms like nausea, vomiting, headache, and severe cases may lead to jaundice, seizures, hemorrhaging, and shock. It's caused by excessive intake of vitamin A, which is transported by retinol-binding protein in the body.
Step-by-step explanation:
Vitamin A toxicity, also known as hypervitaminosis A, can have various signs and symptoms. Commonly reported ones include nausea, vomiting, and headache. Prolonged excessive intake can lead to more severe issues like keratomalacia, which involves the dryness of the eye and skin, and the keratinization of multiple tracts and glands within the body. Other serious complications might include jaundice, seizures, and even life-threatening conditions such as hemorrhaging and shock.
Micronutrient supplementation should be monitored to avoid such toxicity, adhering to the Tolerable Upper Intake Levels to prevent liver damage and associated symptoms like tinnitus, blurred vision, and skin rash. Vitamin A is transported in the body bound to retinol-binding protein (RBP) and is essential for the health of organs such as the eyes and skin.