== المراجع ==* A commoningly used ingredient to lighten hyper-pigmentation* NIH Office of Dietary Supplements - Vitamin A* Retinol binding protein* Merck Manual of Diagnosis and Therapy: Vitamin A Deficiency* WHO publications on Vitamin A Deficiency* BBC News article on Retinol's use as an anti-wrinkle cream
== References ====External links==*A commoningly used ingredient to lighten hyper-pigmentation*NIH Office of Dietary Supplements – Vitamin A*Retinol binding protein*Merck Manual of Diagnosis and Therapy: Vitamin A Deficiency*WHO publications on Vitamin A Deficiency*BBC News article on Retinol's use as an anti-wrinkle cream