What it's normally used for
Vitamin C helps protect against heart disease, repair and regenerate tissues, prevent scurvy, aid in the absorption of iron, and decrease total and LDL ("bad") cholesterol and triglycerides. Research shows that Vitamin C might help protect against a number of cancers by combating free radicals, and help neutralize the effects of nitrites. Vitamin C might also help delay or prevent cataracts, lower the duration and symptoms of the common cold, and support healthy immune function.
Your body uses Vitamin C for healing wounds, repairing, and maintaining the health of your bones and teeth, and helps your body absorb iron. It's Vitamin C's role as an antioxidant that it is the mostly known for.
As a powerful antioxidant, Vitamin C blocks some of the damage from DNA-damaging free radicals. Over time, these free radicals can accelerate aging and contribute to the development of heart disease and other health conditions. It's through this antioxidant effect that Vitamin C may play a role in protecting heart health – possibly as much as exercise.
What it does for Lucid Dreaming
It optimizes the effectiveness of 5-HTP by supporting its conversion to serotonin which can generate more vivid dreams.
My own results
I take Vitamin C after six hours of sleep and my mind is still awake three hours later, and the dreams are more vivid.