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Click here for information about vitamin a deficiency and vitamin a toxicity to buy online vitamin a overdose. is required for vision; vitamin A maintains healthy cells in various structures of the eye and is required for the transduction of light into nerve signals in the retina. It is required for normal growth and development of the embryo and foetus, influencing genes that determine the sequential development of organs in embryonic development. People who limit their consumption of liver, dairy foods, and beta-carotene-containing vegetables can develop a deficiency. Click here for information about vitamin a deficiency and vitamin a toxicity to buy online vitamin a overdose.

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The earliest deficiency sign is poor night vision. Click here for information about vitamin a deficiency and vitamin a toxicity to buy online vitamin a overdose. Since a 1995 report from the New England Journal of Medicine, women who are or could become pregnant have been told by doctors to take less than 10,000 IU (3,000 mcg) per day. Presently, the level at which this vitamin supplementation may cause birth defects is not known, though combined human and animal data suggest that 30,000 IU per day should be considered safe. In a study of people with retinitis pigmentosa (a degenerative condition of the eye), participants received 15,000 IU of the vitamin per day for 12 years with no signs of adverse effects or toxicity. Click here for information about vitamin a deficiency and vitamin a toxicity to buy online vitamin a overdose.