Vitamin C Benefits, Sources and How to Choose a Supplement

Vitamin C is one of the most familiar nutrients in the supplement aisle. Many people reach for it to support immune health, skin, and overall wellness due to its function as an antioxidant. But if you are trying to increase your intake of this vitamin or choose a quality supplement, there is a lot to know.

Because the body cannot make vitamin C on its own, it must come from food or supplements. Understanding what vitamin C does, where it is found, and what to look for on a supplement label can help you choose an option that fits your individual needs

Vitamin C, also called ascorbic acid, is a water-soluble vitamin. Unlike fat-soluble vitamins, the body does not store large amounts of vitamin C, so regular intake is important.

One of vitamin C’s main roles is supporting normal immune function. The immune system relies on several nutrients to function, but vitamin C specifically helps support the activity of several types of immune cells.

Vitamin C is also an antioxidant. Antioxidants help protect cells from free radicals, which are unstable molecules produced through normal metabolism and exposure to certain environmental triggers.

Another important function of vitamin C is supporting collagen production. Collagen is a structural protein found in the skin, bones, cartilage, blood vessels, and connective tissue. The body needs vitamin C to produce and maintain collagen.

Vitamin C also improves the absorption of non-heme iron, the type of iron found in plant foods. Pairing foods such as beans, lentils or leafy greens with a source of vitamin C may help the body absorb more of their iron.

Fruits and vegetables are the primary sources of vitamin C in the diet. Citrus fruits are well-known sources, but many other foods you may not always think of also provide significant amounts.

Vitamin C-rich foods include:

• Oranges, grapefruit and other citrus fruits
• Strawberries
• Kiwi
• Guava
• Bell peppers
• Broccoli
• Brussels sprouts
• Tomatoes
• Cantaloupe
• Potatoes

Vitamin C can be sensitive to heat and prolonged storage. Eating a variety of fresh, frozen, raw and lightly cooked produce can help optimize your intake.

Vitamin C requirements vary based on age, sex and life stage. Adults generally need between 75 and 90 milligrams per day. Needs are higher during pregnancy and breastfeeding.

People who smoke need additional vitamin C because smoking increases oxidative stress and may reduce vitamin C levels in the body.

Most people can meet their daily needs through a varied diet. However, people who eat limited amounts of fruits and vegetables, follow highly restrictive diets, or have certain health conditions may have difficulty getting enough. Speak to your healthcare provider if you think you are not getting enough through your diet.

Food should always be the foundation of a healthy diet. But busy schedules, limited produce intake, stress, and inconsistent eating patterns can make it harder to get enough vitamin C every day because vitamin C is water-soluble and the body does not store large amounts, regular intake matters. A vitamin C supplement can help support daily intake.

When it comes to supplements, more is not always better. Vitamin C absorption decreases as the dose increases and large amounts may cause diarrhea, nausea or stomach cramps. The tolerable upper intake level for adults is 2,000 milligrams per day from food and supplements combined.

When shopping for vitamin C supplements, turn the bottle around and read the supplement facts and ingredient list.
Look for:

• The amount of vitamin C per serving
• The recommended serving size
• Additional ingredients included in the formula
• Third-party certifications such as Non-GMO, gluten-free, vegan or kosher
• Minimal unnecessary binders, fillers, artificial flavors or additives

Supplements should always complement a balanced diet rather than replace vitamin C-rich foods.

If you are looking for a quality vitamin C supplement, Garden of Life Vitamin Code Raw Vitamin C is designed to provide vitamin C in a food-based formula.

Vitamin Code Raw Vitamin C provides 500 mg of vitamin C with naturally occurring bioflavonoids. It also includes a blend of 23 organically grown fruits and vegetables, which add supporting antioxidants, vitamins, and nutrient cofactors. The formula also contains live probiotics and enzymes to support healthy digestion.

Garden of Life’s Vitamin Code formulas are Non-GMO Project Verified, gluten-free and suitable for vegetarian diets.

Vitamin C supports immune function, antioxidant protection, collagen production and iron absorption. Fruits and vegetables are the best foundation for meeting daily vitamin C needs, but supplements can help fill dietary gaps when needed.

When choosing a vitamin C supplement, focus on the dose, serving size, ingredient list and how the product fits into your overall diet. A healthcare professional can also help you determine whether a supplement is appropriate for your individual needs.

References:

1.     Vitamin C. Accessed June 24, 2026. https://ods.od.nih.gov/factsheets/VitaminC-HealthProfessional/

2.     Institute of Medicine (US) Panel on Dietary Antioxidants, Compounds R. Vitamin C. In: Dietary Reference Intakes for Vitamin C, Vitamin E, Selenium, and Carotenoids. National Academies Press (US); 2000.