What it's normally used for
Vitamin A is a required vitamin for growth and development, vision, cell recognition, immune function and reproduction.
Vitamin A is also an antioxidant and acts like a hormone in the body, affecting the expression of genes and influencing phenotype.
Vitamin A deficiency can generate night blindness, higher susceptibility to infections, and dry, bumpy skin.
Vitamin A helps in the growth of bodily tissues, including skin and hair, and it's needed for the creation of sebum, the oil that helps you maintain levels of moisture in the skin and hair.
What it does for Lucid Dreaming
Vitamin A helps with memory.
My own results
I take Vitamin A either before bed or after six hours of sleep and dreams are easier to remember.