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Is vitamin C safe while breastfeeding?

Written by the Full Measure editorial team, which sells supplements. Approved for publication by the Full Measure owners. Updated .

Drafted with AI assistance from the sources listed below. How we write these

Quick answer

NIH gives 120 mg of vitamin C a day while breastfeeding for women 19 and older and an upper limit of 2,000 mg from food and supplements. A small trial in 25 nursing women found intakes above 1,000 mg a day did not significantly change milk vitamin C. No source checked reported harm to nursing infants.1,2

Key facts

  • NIH gives 120 mg of vitamin C a day while breastfeeding for women 19 and older and 115 mg for teens.1,3
  • The upper limit is 2,000 mg a day for adults and 1,800 mg for teens, from food and supplements, and it applies while breastfeeding.1,3
  • In 25 nursing women, total intakes above 1,000 mg a day did not significantly change the vitamin C in milk or in the infants' intake.2
  • NIH says breast milk is considered an adequate source of vitamin C for infants.1
  • NIH says high doses can cause diarrhea, nausea and stomach cramps, and that people with hemochromatosis should avoid vitamin C supplements.1,3

What NIH says about vitamin C while breastfeeding

NIH raises the vitamin C amount for breastfeeding women above the pregnancy amount and keeps the upper limit the same as for other adults. It describes no breastfeeding-specific harm, and it notes that breast milk is considered an adequate source of vitamin C for infants.1,3

The recommended amount is 85 mg a day during pregnancy and 120 mg while breastfeeding, or 80 mg and 115 mg for teens.1

The upper limit for adults is 2,000 mg a day from food and supplements combined, including during pregnancy and breastfeeding. It is 1,800 mg for teens aged 14 to 18 and lower for children. It does not apply to people given vitamin C as medical treatment by a doctor.1,3

MedlinePlus lists the same amounts, and adds that women who are pregnant or breastfeeding and those who smoke need more vitamin C and should ask a health care provider which amount is best.4

What do studies show about vitamin C in breast milk?

A controlled clinical trial gave 25 breastfeeding women 90 mg of vitamin C for a day and then 250, 500 or 1,000 mg a day for two days, or no supplement. Total intakes above 1,000 mg a day, ten times the amount then advised for nursing women, did not significantly change the vitamin C in their milk or the infants' intake. Urine excretion in the mothers rose with intake, which points to a regulatory mechanism for milk.2

A later study in breastfeeding women in Europe and Africa found a similar pattern. Taking 1,000 mg a day for 10 days raised milk vitamin C from 19 to 60 mg/kg in 18 African women and from 60 to 70 mg/kg in 10 European women, and the authors concluded that the vitamin C content of human milk is regulated.5

These studies measured milk levels over days, not infant outcomes over months, so they do not say whether any amount is too much for a baby. They show that more vitamin C in the mother does not simply mean more in the milk.2,5

What does NIH document about high doses of vitamin C?

The documented effects are general, not specific to nursing mothers. NIH says vitamin C has low toxicity and that the most common complaints are gut upset.1

High doses can cause diarrhea, nausea, stomach cramps and other gut upset, because vitamin C that is not absorbed draws water into the gut.1,3

In people with hereditary hemochromatosis, high doses taken for a long time could worsen iron overload and damage tissues. NIH says people with this condition should avoid vitamin C supplements.1,6

Who should ask a doctor about vitamin C while nursing

  • Breastfeeding women thinking about vitamin C above the amounts in a multivitamin, who should ask their doctor or pharmacist.1
  • Women who smoke, since NIH says they need 35 mg more vitamin C a day.1,3
  • Women with hemochromatosis, kidney stones or kidney disease.1
  • Women using vitamin C serums or creams, who should ask a pharmacist, because the sources checked do not address skin products in nursing.

Questions people ask

Is vitamin C serum safe while breastfeeding?

The sources checked cover vitamin C taken by mouth, not serums or creams, which is not a finding either way. Ask your doctor or pharmacist about a specific product.1

Is topical vitamin C safe while breastfeeding?

No source checked tested vitamin C skin products in nursing mothers. A review says how well vitamin C works on skin is poorly understood. Ask your pharmacist.7

Is vitamin C skincare okay while breastfeeding?

The sources checked do not address skincare while nursing. The NIH figures are for vitamin C from food and supplements, where the upper limit is 2,000 mg a day.1

Does vitamin C get into breast milk?

Yes, vitamin C is in breast milk, and studies found the amount is regulated: intakes above 1,000 mg a day in nursing women did not significantly change milk vitamin C.2

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Sources

  1. National Institutes of Health, Office of Dietary Supplements. Vitamin C: Fact Sheet for Health Professionals. Updated July 31, 2025. Opened 2026-10-07.
  2. Byerley LO, Kirksey A. Effects of different levels of vitamin C intake on the vitamin C concentration in human milk and the vitamin C intakes of breast-fed infants. Am J Clin Nutr. 1985;41(4):665-71. A controlled clinical trial in 25 lactating women. Opened 2026-10-11.
  3. Office of Dietary Supplements, National Institutes of Health. Vitamin C: Fact Sheet for Consumers. Updated March 22, 2021. Opened 2026-10-07.
  4. MedlinePlus Medical Encyclopedia. Vitamin C. U.S. National Library of Medicine. Review date 1/21/2025. Opened 2026-10-11.
  5. Daneel-Otterbech S, Davidsson L, Hurrell R. Ascorbic acid supplementation and regular consumption of fresh orange juice increase the ascorbic acid content of human milk: studies in European and African lactating women. Am J Clin Nutr. 2005;81(5):1088-93. A comparative supplementation study in 28 lactating women. Opened 2026-10-11.
  6. Office of Dietary Supplements, National Institutes of Health. Iron: Fact Sheet for Consumers. Updated August 17, 2023. Opened 2026-10-07.
  7. Pullar JM, Carr AC, Vissers MCM. The Roles of Vitamin C in Skin Health. Nutrients. 2017;9(8):866. Opened 2026-10-07.

This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.