If you take a vitamin C pill in the evening, will it cause insomnia over time?

"Vitamin C may affect the duration and quality of sleep. A study comparing short and long sleepers found that people with the lowest vitamin C intake slept for the shortest time. Another study identified high plasma levels of vitamin C among long sleepers.

There was also an associationTrusted Source between lower vitamin C intake and nonrestorative sleep, meaning an individual did not feel rested during the day regardless of how many hours of sleep they had.

Researchers are still determining whether taking vitamin C supplements improves sleep. However, some sleep research in cancer patients suggests that increasing vitamin C consumption may benefit sleep health and improve insomnia symptoms."

Medical News Today