Can I take 1000mg of vitamin C while pregnant?
A dose of 1000 mg (1 gram) of vitamin C during pregnancy is below the tolerable upper intake level of 2,000 mg per day and is unlikely to cause harm for most people. However, that doesn't mean you necessarily need this much, and there are a few things to keep in mind.
RELATED: How to choose a prenatal vitamin
What the evidence says
The Cochrane review on vitamin C in pregnancy found no clear evidence that high-dose vitamin C provides additional benefits for outcomes like preterm birth, preeclampsia, or intrauterine growth restriction.
A separate meta-analysis examining high-dose vitamin C and E supplementation (typically 1000 mg vitamin C combined with 400 IU vitamin E) found that this combination was associated with a small increase in the risk of gestational hypertension and premature rupture of membranes. The concern appears to be most relevant when high-dose vitamin C is paired with high-dose vitamin E, rather than vitamin C alone.
Should you take 1000mg?
For most pregnant people, there's no strong clinical reason to supplement with 1000 mg of vitamin C daily. The RDA is 85 mg, and amounts between 150-500 mg through a combination of diet and supplements are more than sufficient for the vast majority.
However, if your provider has recommended 1000 mg for a specific reason (recovering from illness, documented deficiency, or as part of a targeted protocol), the dose is within the safe range.
Side effects at higher doses
At 1000 mg, some people experience GI symptoms like stomach cramps, diarrhea, or acid reflux. These tend to be dose-dependent and resolve when the amount is reduced.
RELATED: What’s for dinner? A WeNatal approach to fertility-focused evening meals
A note from WeNatal Can you take vitamin C while pregnant
WeNatal for Her includes vitamin C at a dose calibrated to support iron absorption and immune function without the GI risks that come with megadosing. Unless your provider has a specific reason for recommending 1000 mg, the amount in a quality prenatal plus a balanced diet is all most people need.
RELATED: What's for breakfast? A complete week of healthy, easy breakfast recipes
References
Conde-Agudelo A, Romero R, Kusanovic JP, Hassan SS. Supplementation with vitamins C and E during pregnancy for the prevention of preeclampsia and other adverse maternal and perinatal outcomes: a systematic review and metaanalysis. Am J Obstet Gynecol. 2011;204(6):503.e1-503.12. doi:10.1016/j.ajog.2011.02.020
Rumbold A, Ota E, Nagata C, Shahrook S, Crowther CA. Vitamin C supplementation in pregnancy. Cochrane Database Syst Rev. 2015;2015(9):CD004072. Published 2015 Sep 29. doi:10.1002/14651858.CD004072.pub3
