According to Healthline, vitamin C is a powerful antioxidant and also an antihistamine, but it doesn’t work like Zyrtec or Benadryl. Over-the counter antihistamines block histamines while vitamin C lowers your body’s levels of histamine.
Astudy published in the Journal of the American College of Nutrition suggests that those who regularly receive vitamin C can potentially decrease their histamine levels. Healthline reports that vitamin A may be helpful for mild to moderate allergies. It can also help with environmental offenders such as pollen, dust and pet dander. Studies have shown that nasal sprays containing vitamin C may also help to alleviate allergy symptoms.
Talk to your doctor if you have severe allergies. You may also be advised by your doctor to increase the amount of vitamin C in your daily diet.