Xerophthalmia is the clinical spectrum of ocular manifestations of vitamin A deficiency; these range from the milder stages of night blindness and Bitot spots to the potentially blinding stages of corneal xerosis, ulceration and necrosis (keratomalacia).
Acute systemic vitamin A toxicity typically arises when an individual consumes over 100,000 RAE within a short period, often from supplements or high-dose medications. The toxicity symptoms include nausea, vomiting, headache, dizziness, irritability, blurred vision, and muscular incoordination.
What is vitamin A deficiency? Vitamin A deficiency is when your body lacks the amount of vitamin A it needs to function properly. Vitamin A deficiency can cause vision loss and blindness. It can also lead to complications with your skin, heart, lungs, tissues and immune system.
The main symptom of vitamin A deficiency is vision loss and blindness. Vision loss often begins as a problem adjusting to seeing in the dark, or night blindness. People with night blindness do not see well in the dark. But they can see normally if enough light is present.
Side effects that you should report to your care team as soon as possible: Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat. Bone or joint pain. Increased pressure around the brain—severe headache, blurry vision, change in vision, nausea, vomiting.
What happens if I take too much vitamin A? Some research suggests that having more than an average of 1.5 mg (1,500 µg) a day of vitamin A over many years may affect your bones, making them more likely to fracture when you're older.
“You should seek medical attention if you have taken mega doses of vitamins — whether that's early on or if you have been taking them for several months and experience seizures, changes in mood, including irritability or confusion, increase in headaches or fatigue, or onset of GI [gastrointestinal] symptoms like ...
Vitamin A from foods is considered safe. But you can get too much from supplements. For adults, 19 and older, the tolerable upper limit for vitamin A is 10,000 IU per day. Talk to your doctor before taking any dose close to that amount.
Fat-soluble vitamins (like A, D, E, and K) don't get flushed out in the urine, so they're the most likely to cause vitamin toxicity. Vitamins A and E may pose the greatest risk of toxicity, since they are so commonly taken and readily available.
Vitamin B Deficiencies
Vitamin B1 deficiency will cause toxic optic neuropathy and can cause blurred vision. Vitamin B2, B3 and B6 deficiencies will lead to eye infections and dry eyes. Vitamin B12 deficiency may cause retinal bleeding and nerve tissue damage and can lead to permanent vision loss.
Vitamin K is a group of vitamins that the body needs for blood clotting, helping wounds to heal. There's also some evidence vitamin K may help keep bones healthy.
If vitamin B12 deficiency is left untreated, it can cause lasting side effects that affect the nervous system and brain. More severe side effects of vitamin B12 deficiency include: Peripheral neuropathy. Degeneration of the spinal cord.
Even the lowest doses in B12 supplements are many times the recommended dietary allowance. Doses up to 1,000 mcg, though unnecessary, aren't harmful. Fortified foods. Many breakfast cereals, soy products, and yeasts are fortified with B12.
(Vitamin A Toxicity)
Consuming too much vitamin A causes hair loss, cracked lips, dry skin, weakened bones, headaches, elevations of blood calcium levels, and an uncommon disorder characterized by increased pressure within the skull called idiopathic intracranial hypertension.
Taking high doses of vitamin A supplements can cause liver damage. Combining high doses of vitamin A supplements with other drugs that can damage the liver could increase the risk of liver disease.
Ans: The best vitamins for a good hair care experience are Vitamin B12, Vitamin C, Vitamin D, and Vitamin E. They should be ably supported with other nutrients and minerals like Zinc, Biotin, Iron, and Keratin for the best results.
If you take too much preformed vitamin A while pregnant, it can cause birth defects in your baby, including abnormal eyes, skull, lungs, and heart. If you are or might be pregnant or breastfeeding, you should not take high-dose supplements of preformed vitamin A.
Vitamin A is essential for maintaining healthy hair, but the key lies in achieving the right balance. Both too much or too little Vitamin A can cause hair loss. Vitamin A deficiency (often seen in restrictive diets and inflammatory bowel disorders) may result in dry, brittle hair prone to thinning.
Consuming excess amounts of fat-soluble vitamins like K, E, D, and A can cause a wide range of symptoms, including but not limited to: Nausea or vomiting. Diarrhea. Fatigue.