Vitamin C has earned a notorious reputation for supposedly interfering with sleep. From childhood warnings against orange juice before bed, many believe it keeps us awake. But is there truth to this? Nutrition experts recommend vitamin C-rich fruits and vegetables with every meal, and they rarely cause insomnia.
This misconception traces back to early vitamin C supplement packaging. Leaflets warned: "Preferably avoid taking this medicine at the end of the day due to its slightly stimulating effect."
The caution originated with Roche's 1934 vitamin C launch. As a precaution, they noted vitamin C's role in dopamine synthesis—a neurotransmitter linked to alertness and wakefulness.
This warning persists unquestioned in product labels today.
While rat studies show high doses amplify dopamine's excitatory effects, no research links vitamin C to human sleep disruption.
A clinical trial tested this: Healthy volunteers took 4 grams of vitamin C before bed (equivalent to 10 kilos of oranges). Brain activity recordings revealed no changes in sleep cycles or morning disturbances.
Similar findings appear in other studies. Common sense supports this—kiwis, cabbage, blackcurrants, and peppers contain more vitamin C than oranges, yet none provoke insomnia.
Enjoy oranges, vitamin C tablets, or a glass of juice before bed without worry—even for kids!
*Source: Ginger is an aphrodisiac, and other misconceptions about food, by Sarah Pellet-Calaud, Thierry Souccar editions.
