Deficiency symptoms: dry skin, brittle hair, transverse nail streaks, chicken blindness, skin rashes
Where: liver, carrot, spinach, broccoli, pumpkin, cod liver oil, salmon
Dietary studies show that many adults in the US are not meeting their dietary needs for vitamin A (Micronutrient Inadequacies in the US Population: an Overview, 2017). Many of them attribute skin or eye problems to age or climate, which is fundamentally wrong.
Vitamin A is essential for the synthesis of rhodopsin, the pigment of the photoreceptors in the retina, so if your eyesight deteriorates, you should get tested for retinol before you go to the ophthalmologist. Vitamin A is also one of the crucial supplements for women in their thirties.