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Cod liver oil. Bubble pack of cod liver oil capsules. Cod liver oil is obtained from the liver of fresh cod fish, and it represents a valuable source of vitamin A and D. These vitamins are also present in dairy produce and vitamin A in green vegetables and carrots. Vitamin D deficiency causes osteomalacia (bone softening) in adults while vitamin A deficiency produces defective vision in dim light and a thickening and hardening of the skin.
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