Important for vision (especially in dim light), healthy skin and mucous membranes, and immune system function.
Liver, egg yolk, butter, full-fat dairy products. The plant-based precursor (beta-carotene) is found in carrots, sweet potatoes, spinach, kale, and other orange/dark green vegetables.
Poor vision in dim light (night blindness), dry skin and dry eyes, and increased susceptibility to infections. Rarely occurs in Belgium/Netherlands with a normal, varied diet.