Daily Vitamin C Intake: How Much Vitamin C Do You Need?

By The DRI Calculator Team  |  Published: July 29, 2026  |  Updated: July 29, 2026  |  9 min read

Your daily vitamin C intake should be 90 milligrams for men and 75 for women, and here is the part that surprises people: taking much more than that is largely wasted. Vitamin C is one of the few nutrients humans cannot make or store, so a steady daily supply matters, but the body can only absorb and hold so much at once. Beyond a certain point the excess is simply passed out in urine. This guide covers the real numbers by age and sex, explains why mega dose supplements do far less than the label suggests, names the foods that beat an orange, and gives an honest answer to the oldest question about this vitamin: does it actually help with colds. All from the official data, with nothing to sell you.

What Your Daily Vitamin C Intake Should Be

The recommendation comes from the Recommended Dietary Allowance set by the National Academies. For adults it is 90 milligrams a day for men and 75 milligrams for women, rising to 85 milligrams in pregnancy and 120 milligrams while breastfeeding. Our guide to what DRI is explains how the RDA and the upper limit fit together.

Vitamin C matters because the body cannot produce it and does not store it in any meaningful reserve. It is needed to make collagen, the protein that holds skin, blood vessels, and connective tissue together, and it works as an antioxidant that protects cells from damage. It also helps the body absorb iron from plant foods, a useful role covered further below. Because there is no store to draw on, a regular daily supply from food is what keeps levels steady.

Daily Vitamin C Intake by Age & Sex (Full Chart)

Vitamin C needs climb through childhood and settle into the adult figures in the late teens, with small increases for pregnancy and breastfeeding, and an added amount for smokers.

How much vitamin C do you need per day?

Adult men need 90 milligrams of vitamin C a day and adult women need 75 milligrams. Pregnancy raises the target to 85 milligrams and breastfeeding to 120 milligrams. Teenagers aged 14 to 18 need 75 milligrams (boys) and 65 milligrams (girls). People who smoke need an extra 35 milligrams a day on top of these figures. The male target of 90 milligrams is the highest among adults, as covered in our guide to the DRI for men, while the figures across female life stages are set out in our guide to the DRI for women.

Why More Isn't Better: The Absorption Ceiling

This is the single most useful thing to understand about vitamin C, and it explains why the 1,000 milligram tablets on the shelf do far less than their size implies. The body absorbs vitamin C very efficiently at normal intakes, but that efficiency falls sharply as the dose rises.

At intakes up to about 200 milligrams at a time, the body absorbs nearly all of it. Push the dose higher and the percentage absorbed drops steadily. Once the tissues are saturated, which happens at a daily intake somewhere around 200 to 400 milligrams, the body simply excretes any extra in the urine. A 1,000 milligram supplement does not give you ten times the benefit of 100 milligrams from food. Most of it is passed straight out.

Best Food Sources of Vitamin C

Vitamin C is abundant in fruits and vegetables, and oranges are far from the top of the list. Bell peppers, in particular, carry more per serving than any common fruit, and a wide range of everyday produce clears the daily target in a single portion.

Because vitamin C is sensitive to heat and water, raw and lightly cooked produce retains the most. A single red pepper or one orange plus a handful of strawberries already covers a full day, which is why deficiency is rare for anyone eating fruit and vegetables regularly.

Vitamin C & Colds: The Honest Answer

No question about this vitamin is asked more often, and the honest answer sits between the two extremes people expect. For the general population, taking vitamin C regularly does not prevent colds. The popular belief that it does has not held up in research.

There is a narrower, more modest effect. Taking vitamin C consistently may slightly reduce how long a cold lasts and how severe it feels, and this shows up more clearly in people under heavy physical stress, such as marathon runners. Starting a high dose only once symptoms have already begun does not reliably help. So vitamin C is not a shield against catching a cold, though a steady adequate intake may take a little off the duration. That is a smaller claim than the supplement aisle makes, and it is the accurate one.

Vitamin C & Iron Absorption

One of vitamin C's genuinely useful and underappreciated roles is helping the body absorb iron from plant foods. Non heme iron, the form found in beans, lentils, spinach, and fortified grains, is absorbed far less efficiently than the iron in meat. Vitamin C changes iron into a form the gut takes up more readily, which can substantially increase how much you absorb from a plant based meal.

The practical move is simple: pair iron rich plant foods with a source of vitamin C in the same meal, such as peppers with beans, or citrus alongside a lentil dish. This is especially valuable for vegetarians and anyone prone to low iron, a topic covered in our guide to daily iron intake.

Why Smokers Need More Vitamin C

People who smoke have an official recommendation to take an extra 35 milligrams of vitamin C a day, bringing the total to 125 milligrams for men and 110 for women. The reason is that smoking increases oxidative stress and the rate at which the body uses up vitamin C, so smokers tend to have lower blood levels at any given intake. The extra 35 milligrams compensates for that faster turnover. People regularly exposed to secondhand smoke may also fall short and benefit from making sure they reach the standard target. Pregnancy and breastfeeding also raise the requirement, part of the wider set of changes covered in our guide to the DRI for pregnancy.

Signs of Low Vitamin C

Because so little vitamin C is needed and it is so widely available in produce, deficiency is uncommon in most countries, but it does occur. Early signs are vague and include tiredness, irritability, and a general feeling of being run down. As a shortfall continues, more specific signs appear: easy bruising, bleeding or swollen gums, slow wound healing, and dry rough skin, all reflecting the vitamin's role in collagen. The severe, prolonged deficiency known as scurvy is rare today but still seen in people with very limited diets, heavy alcohol use, or certain medical conditions. Those most at risk include smokers, people with very restricted diets, and those with conditions that impair absorption. Persistent symptoms are a reason to see a doctor rather than to reach for high dose tablets.

Can You Take Too Much Vitamin C?

Vitamin C is water soluble and genuinely excess amounts leave the body, so it has a good safety record, but there is still an upper limit. For adults the tolerable upper intake level is 2,000 milligrams a day from all sources.

How to Hit Your Daily Vitamin C Intake

For almost everyone, food covers this easily and does it better than a tablet. A single serving of peppers, citrus, kiwi, broccoli, or strawberries clears the daily target, and spreading fruit and vegetables across your meals keeps levels topped up far more effectively than one large supplement. Keep produce raw or lightly cooked where you can, since heat and water reduce the content. Pair vitamin C foods with plant iron sources to get the absorption bonus. And unless a doctor has advised otherwise, there is no need to chase mega doses, because your body cannot use them.

The most useful starting point is your own number, since it depends on your age, sex, and whether you smoke. Your full nutrient targets, vitamin C included, take only a moment to calculate.

Frequently Asked Questions