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Vitamin A status involves eye health via two separate functions. Retinal is an essential factor in rod cells and cone cells in the retina responding to light exposure by sending nerve signals to the brain. An early sign of vitamin A deficiency is night blindness. [6] Vitamin A in the form of retinoic acid is essential to normal epithelial cell ...
Vitamin A deficiency is the leading cause of preventable childhood blindness worldwide and is a major cause of childhood mortality. [1] Each year, approximately 250,000 to 500,000 malnourished children in the developing world go blind from a VAD, with about half of whom dying within a year of losing their sight. [2]
The predominant cause of nutritional optic neuropathy is thought to be deficiency of B-complex vitamins, particularly thiamine [2] (vitamin B 1), cyanocobalamin (vitamin B 12) and recently copper. [3] Deficiency of pyridoxine (vitamin B 6), niacin (vitamin B 3), riboflavin (vitamin B 2), and/or folic acid also seems to play a role. Those ...
In one small study, people with insomnia who took a supplement containing a combination of magnesium, melatonin, folate and vitamins B6 and B12 one hour before bedtime every day for three months ...
Vitamin B12 deficiency symptoms . Vitamin B12 deficiency has a few hallmark symptoms, according to doctors: Lack of energy. Mental fatigue. Nausea, vomiting, or diarrhea. Lack of appetite. Weight loss
Retinol, also called vitamin A 1, is a fat-soluble vitamin in the vitamin A family that is found in food and used as a dietary supplement. [3] Retinol or other forms of vitamin A are needed for vision, cellular development, maintenance of skin and mucous membranes , immune function and reproductive development. [ 3 ]
Abnormal vision. Back pain. Nausea. Dizziness. Rash. Viagra could lead to more serious side effects, such as: Priapism (a painful, long-lasting arousal) Vision loss. Chest pain. Flu-like symptoms ...
Night blindness may exist from birth, or be caused by injury or malnutrition (for example, vitamin A deficiency). It can be described as insufficient adaptation to darkness. The most common cause of nyctalopia is retinitis pigmentosa , a disorder in which the rod cells in the retina gradually lose their ability to respond to the light.
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