What Foods Have Vitamin C | Sources & Benefits

Vitamin C (ascorbic acid) is a water-soluble vitamin the body cannot produce or store. Because it is eliminated rapidly, you must replenish it daily through either your diet or supplements. As an essential nutrient involved in more than 300 metabolic functions, Vitamin C is critical for the growth and repair of tissues throughout the body, the production of collagen, and the maintenance of a healthy immune system.

Understanding what foods have Vitamin C is the first step toward ensuring adequate intake. The best sources are fruits and vegetables — especially citrus fruits, red and green peppers, kiwifruit, broccoli, strawberries, and Brussels sprouts. Orange juice, grapefruit juice, and tomato juice also contain large amounts of Vitamin C, and some breakfast cereals are fortified with it. Vitamin C is not found in significant amounts in animal-based foods.

Because Vitamin C is water-soluble and susceptible to heat, cooking can reduce the Vitamin C content of food considerably. Up to 50 percent of the vitamin can be lost through boiling. To maximize your intake, eat fruits and vegetables raw or lightly steamed whenever possible.

Vitamin C is a critical component of both basic body-building functions and disease prevention. It is needed for the healing of wounds and the repair and maintenance of cartilage, bones, and teeth. During any kind of healing process — whether from infection, injury, disease, or surgery — the body uses large amounts of Vitamin C.

Research suggests that Vitamin C functions as a potent water-soluble antioxidant, helping block damage from free radicals. It can quench a variety of reactive oxygen species and reactive nitrogen species, and studies indicate that Vitamin C and vitamin E work synergistically, having a greater effect together than separately.

Vitamin C is essential for collagen biosynthesis. Collagen is the most abundant protein in the human body and serves as the building block of connective tissues including skin, tendons, ligaments, and blood vessel walls. Without adequate Vitamin C, the enzymes responsible for stabilizing collagen cannot function properly.

Additionally, Vitamin C is an immune system supporter that may help increase white blood cell production. It contributes to immune defense by supporting various cellular functions of both the innate and adaptive immune system, including enhancing phagocytosis, promoting lymphocyte proliferation, and supporting epithelial barrier function against pathogens. Vitamin C also increases the absorption of iron from plant-based foods by reducing ferric iron to ferrous iron in the gastrointestinal tract.

The Recommended Dietary Allowance (RDA) for Vitamin C is 90 mg/day for adult men and 75 mg/day for adult women. Pregnant women are recommended to increase their intake to 85 mg/day, lactating women to 120 mg/day, and smokers should add an extra 35 mg/day regardless of sex. For infants and children, the RDA ranges from 15 to 115 mg depending on age.

According to the National Health and Nutrition Examination Survey (NHANES), mean intakes of Vitamin C from food and beverages are 105.2 mg/day for adult males and 83.6 mg/day for adult females, meeting the RDA for most nonsmoking adults. However, some 70 to 90 percent of usual dietary intakes (30 to 180 mg/day) are absorbed, and absorption falls to about 50 percent or less with increasing doses above 1 g/day.

The Tolerable Upper Intake Level (UL) for adults has been set at 2,000 mg per day. Doses above this level can lead to stomach upset and diarrhea, and rarely, kidney stones. The body cannot store Vitamin C, so serious side effects from excessive intake are very uncommon.

Anyone who wants to support overall health should be aware of what foods have Vitamin C and how to maintain adequate levels. Individuals who may especially benefit from monitoring their Vitamin C intake include those recovering from infection, injury, or surgery, since the body uses large amounts of the vitamin during healing.

People whose diets are limited in fresh fruits and vegetables, smokers (who require an additional 35 mg/day), and individuals under brief periods of severe physical exercise may find it particularly important to ensure adequate Vitamin C status. Research suggests that populations under high physical stress — such as marathon runners and military personnel — may see more pronounced benefits from regular Vitamin C intake.

When dietary intake alone is not sufficient, a Vitamin C supplement can help bridge the gap. This is especially relevant during seasons or situations where access to fresh produce is limited.

Take one (1) tablet, one (1) to three (3) times daily with meals, or as directed by a health care professional. Store in a cool, dry place and away from direct light.

This product is gluten free, dairy free, soy free, and grain free, making it accessible for those with common dietary sensitivities.

Taking too much Vitamin C can cause side effects including upset stomach, stomach cramps or bloating, and loose stools. Because Vitamin C may make iron more easily absorbed, high doses are not recommended for people with hemochromatosis. People with G6PD deficiency should not take high doses of Vitamin C. Individuals who are pregnant, taking warfarin, statins, estrogen-containing medications, or protease inhibitors should consult a health care professional before supplementing.