Vitamin A deficiency should be addressed by eating foods rich in vitamin A, such as a variety of animal livers, or through vitamin A supplements. Vitamin A belongs to the fat-soluble vitamins, a class of substances that contain the structure and biological activity of retinol. In general, good sources of vitamin A are animal foods such as various animal livers, cod liver oil, and fish eggs. Plant foods can only provide carotenoids, the precursors of vitamin A, such as dark green or red-orange-yellow vegetables and fruits like broccoli and spinach. Vitamin A supplements are available in the form of vitamin A softgels and Nineveh Cod Liver Oil. When taking vitamin A through supplements, it should be done under the guidance of a professional doctor. If you experience any discomfort during the supplementation process, you should seek medical attention.