Retinal is the vitamin A derivative that is most toxic, due to its chemical reactivity. Even when vitamin A is used only for light sensing, retinal can be ...

When taken by mouth: Vitamin A is LIKELY SAFE for most people in amounts less than 10,000 units (3,000 mcg) daily. Keep in mind that vitamin A is available in ...

Vitamin A. Both the upper and lower layers of skin need vitamin A. It seems to prevent sun damage by interrupting the process that breaks down collagen. Since ...

Vitamin A helps to speed up healing, prevent breakouts and support the skin's immune system and it promotes natural moisturising - which means it helps to ...