Vitamin C

Grapefruit is an excellent source of vitamin C: one-half grapefruit provides you with half of the daily recommended value (DV), and an 8-ounce glass of 100% grapefruit juice contains between 85-100% DV.*

  • Vitamin C is an antioxidant and works with other vitamins and enzymes in the body to provide antioxidant protection.1-4
  • Vitamin C plays a key role in supporting a healthy immune system to help the body resist infection. 1-4
  • Vitamin C is thought to have an anti-histamine effect,1,4,5 may support lung function,1,6 and may reduce the duration and severity of cold symptoms.7
  • Vitamin C supports collagen production, which is needed for the maintenance of healthy skin, bones, and gums.1-4 Collagen breakdown in the skin may lead to the appearance of premature aging.8
  • The absorption of iron from plants may increase when consumed with vitamin C.1-4 Thus, eating grapefruit with plants high in iron, such as dark leafy greens or lentils, may help your body absorb more iron.
  • Vitamin C needs greatly increase during breastfeeding.1
  • Vitamin C intake by mothers may influence the amount of vitamin C in breastmilk;9 for example, drinking 3-5 servings of orange juice per week doubled breast milk vitamin C concentrations.10


  1. Vitamin C. Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Vitamin C, Vitamin E, Selenium, and Carotenoids. Washington, D.C.: National Academy Press; 2000:95-185.
  2. Vitamin C. Linus Pauling Institute Micronutrient Information Center. Oregon State University.
  3. Lykkesfeldt et al. Adv Nutr 2014; 5:16-18.
  4. Vitamin C. Health Professionals Fact Sheet. Office of Dietary Supplements. National Institutes of Health.
  5. Chatterjee et al. Annals of the New York Academy of Sciences. 1975;258(1):24-47.
  6. Hemila, BMJ Open. 2013;3:002416.
  7. Hemila et al. Cochrane Database Syst Rev. 2013(1):Cd000980.
  8. Dermatologic Therapy. 2007;20:314-321.
  9. Bravi et al. Am J Clin Nutr 2016;104:646-62.
  10. Daneel-Otterbech et al. Am J Clin Nutr. 2005; 81:1088-1093.