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Click here for information about vitamin a overdose and information on vitamin a to buy online vitamin a facts. The earliest deficiency sign is poor night vision. For most people, up to 25,000 IU (7,500 mcg) of this vitamin per day is considered safe. 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. Click here for information about vitamin a overdose and information on vitamin a to buy online vitamin a facts.

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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 overdose and information on vitamin a to buy online vitamin a facts. Many people assume certain aspects of diet are linked to acne, but there is not much evidence to support this idea. It helps cells reproduce normally a process called differentiation (cells that have not properly differentiated are more likely to undergo pre-cancerous changes). This vitamin is also available in supplement form. Click here for information about vitamin a overdose and information on vitamin a to buy online vitamin a facts.