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Comparison · Pregnancy Smart

Best pregnancy-safe immune support

Assigned clinical reviewerMichael Yuzefovich· MD, FACOGDraft · pending clinical reviewUpdated

How do the options compare?

The vaccine schedule sits above this table. What follows grades the supplement aisle on what the trials actually measured, the dose they used, and whether that dose fits inside a safe daily total.

OptionStudied pregnancy doseGuideline supportNotes
Vitamin CThe adult safe upper limit is 2,000 mg a day, and cold trials used at least 0.2 grams dailyRegular intake might decrease cold symptoms and shorten how long a cold lasts, while starting it after symptoms appear does not appear to helpNCCIH notes regular intake did not lower how often people in the general population caught colds.
ZincThe adult safe upper limit is 40 mg a day, while lozenge trials used about 80 to 92 mg a dayZinc lozenges and zinc syrup may shorten a cold when started within 24 hours of the first symptomsThe studied lozenge dose sits above the adult daily limit, and high long-term intake can lower blood copper and impair immune function.
Vitamin DThe adult safe upper limit is 100 mcg (4,000 IU) a daySome studies suggest a slightly lower chance of a respiratory infection, especially in people with low vitamin D levels, while other research found no effectYour prenatal already contributes here, so this is a running-total question rather than a new-bottle question.
ElderberryNo pregnancy dose establishedElderberry does not appear to reduce the risk of coming down with a cold, and NCCIH finds the trial evidence short of conclusiveLittle is known about whether elderberry is safe during pregnancy or while breastfeeding.
EchinaceaDoses varied widely across studies, using different species and preparationsEchinacea might slightly reduce the risk of catching a cold, without reducing symptom severity or shortening the illnessNCCIH grades the overall evidence for clinically relevant effects as weak.
ProbioticsVarious strains and doses have been testedProbiotics might reduce the risk of some respiratory infections and shorten the illness, though it varies by formulationNCCIH rated the quality of that evidence low or very low.
  • The CDC recommends the inactivated flu vaccine in any trimester, and getting it in the third trimester also protects your baby during their first few months of life. 1
  • The CDC routinely recommends Tdap during each pregnancy, usually around 27 to 36 weeks, along with the RSV vaccine in its specified window, the COVID-19 vaccine, and the inactivated flu vaccine. 2
  • Vitamin C, vitamin D, zinc, and selenium all play roles in immune function, but no single supplement has been shown to lower your chance of getting sick beyond simply meeting your daily nutrient targets. 3
  • Elderberry and echinacea have limited-to-moderate evidence in general adult studies, but neither has solid pregnancy-specific research behind it. 4
  • Pregnant people face a higher risk of severe flu illness and hospitalization than non-pregnant adults, which is a big part of why vaccination matters more here than stacking supplements. 5

Which option makes sense?

No supplement in this table has been shown to lower your chance of getting sick beyond meeting your daily nutrient targets, and the zinc dose that shortened colds in trials runs above the adult daily limit, which is why the vaccine schedule does the heavy lifting here.

Disclosure: Pregnancy Smart offers a supplement that overlaps with one or more options above. This page describes the pregnancy evidence for each option on its own merits.

Frequently asked questions

If I could do only one immune thing for my pregnancy, what should it be?

Get the seasonal flu shot in whichever trimester you're in, and add Tdap in the 27 to 36 week window. Both have the strongest pregnancy-specific evidence for lowering your chance of severe illness.

Should I take extra vitamin C or zinc?

Your prenatal vitamin already supplies pregnancy-appropriate amounts of vitamin C and zinc. Taking more on top of that is worth checking with your provider first, since the evidence for extra amounts beyond your prenatal target is limited.

What about elderberry, echinacea, or other immune botanicals?

The pregnancy-specific evidence on these is thin. See our elderberry and echinacea safety guides for the details on each.

How do household contacts protect me?

The CDC recommends what's called cocooning: getting the people close to you vaccinated, especially before your newborn arrives, as a documented way to lower your exposure risk.

Related in the library

References

  1. Flu & Pregnancy: CDC

    CDC · https://www.cdc.gov/flu/highrisk/pregnant.htm

  2. Guidelines for Vaccinating Pregnant Women: CDC

    CDC · https://www.cdc.gov/vaccines-pregnancy/hcp/vaccination-guidelines/index.html

  3. Dietary Supplements for Immune Function and Infectious Diseases: Consumer, NIH ODS

    ODS · https://ods.od.nih.gov/factsheets/ImmuneFunction-Consumer/

  4. The Common Cold and Complementary Health Approaches: NCCIH

    NIH · https://www.nccih.nih.gov/health/providers/digest/the-common-cold-and-complementary-health-approaches-science

  5. Flu Vaccine Safety and Pregnancy: CDC

    CDC · https://www.cdc.gov/flu/vaccine-safety/vaccine-pregnant.html

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.