A deuterated analogue of an essential micro-nutrient. Vitamin A (or Vitamin A Retinol, retinal, and four carotenoids including beta carotene) is a vitamin that is needed by the retina of the eye in the form of a specific metabolite, the light-absorbing molecule retinal, that is necessary for both low-light (scotopic vision) and color vision. Also, it is an intermediate in the synthesis of all-trans-Retinol-d5, >80% (R252002).