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There's no such thing as vitamin A—not really. It's a blanket term for a group of related compounds like retinoids and carotenoids that your body needs but can't make itself. Instead, you get these nutrients from the foods you eat. It's far more beneficial to get vitamin A from the foods you eat, such as carrots and leafy green vegetables, such as dandelion greens, than from taking vitamin supplements. Most people get plenty of retinoids and carotenoids in their daily diet, and overdoing it can cause the same kind of damage as not getting enough.