Vitamin A 10,000 IU from Webber Naturals offers the highest potency vitamin A supplement available to support immune function, eyesight, and night vision, as well as skin and mucous membrane health.Vitamin A is an essential nutrient that promotes healing and supports immune system activity to fight infection. It also plays a role in healthy epithelial tissue that lines the nose, throat, mouth, eyes, lungs, and intestines, where it acts as a first line of defence against infection. In addition, vitamin A is needed for the healthy development and maintenance of eyesight and night vision.The main dietary source of vitamin A is animal liver, which is not commonly eaten, creating a risk of nutrient deficiency in many adults. The body can convert some beta-carotene into vitamin A, but this ability may have been overestimated. The best way to ensure a sufficient intake of vitamin A is to get it directly from fish or fish liver oil. Vitamin A from Webber Naturals features vitamin A sourced from cod liver oil.