Pregnant women need 85 mg of vitamin C per day if they’re 19 or older, and 80 mg per day if they’re 14 to 18. That’s only slightly more than the 75 mg and 65 mg recommended for non-pregnant women in those same age groups. Most women can hit this target through food alone, and a standard prenatal vitamin covers any gaps.
Why the Recommendation Increases During Pregnancy
Your body needs more vitamin C during pregnancy because the nutrient plays a direct role in building fetal tissue. Vitamin C is essential for producing collagen, the structural protein that forms the scaffolding of your baby’s skin, bones, blood vessels, and connective tissue. It also supports the development of the protective membranes surrounding the fetus.
The nutrient’s role in brain development is especially notable. Vitamin C acts as a co-factor for enzymes involved in producing neurotransmitters, and it helps drive the formation of myelin sheaths, the insulating layer around nerve fibers that allows signals to travel efficiently. Animal research shows that inadequate vitamin C during prenatal development can impair hippocampal growth (a brain region critical for memory and learning) and increase oxidative stress in the developing brain. In the most extreme cases of deficiency, animal models show vertebral defects, lung problems, and even embryonic death.
The Link to Membrane Strength and Preterm Birth
Vitamin C helps maintain the integrity of the chorioamniotic membranes, the layers of tissue that hold the amniotic fluid and protect the baby. Because collagen is a key structural component of these membranes, low vitamin C levels have been associated with a higher risk of preterm premature rupture of membranes (PPROM), which is when these layers break before 37 weeks.
Studies have found lower levels of vitamin C in the blood, white blood cells, and amniotic fluid of women who experienced PPROM compared to those who didn’t. In one study, PPROM occurred in about 45% of a control group but only 32% of women receiving vitamin C supplementation. For women with a history of PPROM, supplementation starting after 14 weeks of gestation appeared to offer a protective effect. This doesn’t mean megadosing prevents preterm birth, but it does mean consistent, adequate intake matters.
Vitamin C Helps You Absorb Iron
Iron deficiency anemia is one of the most common nutritional concerns during pregnancy, and vitamin C plays a supporting role here too. It converts the form of iron found in plant foods and supplements into a form your body absorbs more easily. The World Health Organization recommends eating fruits and vegetables rich in vitamin C alongside iron-rich foods specifically for this reason.
A Cochrane review found that pregnant women who took iron supplements along with vitamin C had a greater reduction in anemia prevalence than those taking iron alone, though the differences in specific blood markers like hemoglobin and ferritin were modest. In practical terms, pairing your iron supplement or iron-rich meal with a glass of orange juice or a serving of bell peppers can make a real difference in how much iron your body actually uses.
Foods That Meet the Daily Target
Reaching 80 to 85 mg of vitamin C through food is straightforward. A single medium orange provides about 70 mg. A half cup of red bell pepper delivers roughly 95 mg, which alone exceeds the daily goal. One medium kiwi has around 64 mg, and a cup of strawberries provides about 85 mg. Broccoli, tomatoes, and cantaloupe are also solid sources.
Because vitamin C is water-soluble and sensitive to heat, raw or lightly cooked fruits and vegetables retain the most. Steaming rather than boiling helps preserve the nutrient. If you’re eating a varied diet with several servings of fruits and vegetables each day, you’re almost certainly meeting or exceeding the requirement. A prenatal vitamin typically contains vitamin C as well, providing an additional buffer.
Upper Limits and Risks of Too Much
More is not better. The tolerable upper intake level for vitamin C during pregnancy has not been set at a level that encourages high-dose supplementation. Doses above 2,000 mg per day can cause digestive issues like diarrhea and nausea in anyone, and pregnancy adds a specific concern: there is a published report of two infants whose mothers took more than 400 mg per day during pregnancy who developed signs of vitamin C deficiency after birth. The theory is that the babies’ bodies adapted to processing large amounts of the vitamin in the womb, then couldn’t adjust quickly enough after delivery.
That said, larger reviews of the evidence have questioned whether this “rebound” effect is real. Experimental studies in both guinea pigs and humans attempting to reproduce it have failed, and some researchers consider the claim unfounded. Still, taking megadoses of any supplement during pregnancy without a specific medical reason introduces unnecessary uncertainty. Sticking to the recommended range through food and a standard prenatal vitamin is the most evidence-supported approach.
What Professional Guidelines Recommend
The American College of Obstetricians and Gynecologists lists vitamin C among the essential nutrients for pregnancy but does not single it out for additional supplementation beyond what a healthy diet and prenatal vitamin provide. Their guidance is clear: eating well and taking a daily prenatal vitamin should supply the vitamins and minerals you need. If your provider identifies a specific deficiency, they may recommend a separate supplement, but routine megadosing is not part of standard prenatal care.
Women who smoke have higher vitamin C turnover and generally need more than non-smokers. Outside of pregnancy, smokers are advised to add 35 mg per day on top of the standard recommendation. If you smoke during pregnancy, this is worth discussing with your provider, as your baseline needs are higher and your baby’s development may benefit from ensuring adequate levels.