Is Emergen-C safe while breastfeeding?

What does the evidence say about Emergen-C while breastfeeding?

1. Vitamin C is a normal component of human milk and a key milk antioxidant, with average mature milk concentrations of 50 to 90 mg/L in mothers eating adequate vitamin C. 1
2. Doses of 250, 500, or 1,000 mg daily produced milk levels between 100 and 120 mg/L that did not significantly differ between the groups, and high daily doses up to 1,000 mg are not a reason to discontinue breastfeeding. 1
3. The recommended vitamin C intake while lactating is 120 mg a day, with a Tolerable Upper Intake Level of 2,000 mg for adults, and intakes above that most commonly cause diarrhea, nausea, and abdominal cramps. 2
4. MotherToBaby puts the same numbers in stage terms: 120 mg a day while breastfeeding for ages 19 and up, 115 mg for ages 14 to 18, against a 2,000 mg upper limit, and notes vitamin C is a normal part of breastmilk. 3
5. If your packet also carries zinc, the lactation RDA is 12 mg a day with an adult upper limit of 40 mg, and 50 mg or more over weeks can interfere with copper absorption. 4

How Emergen-C changes by nursing stage

• Early weeks. In the early weeks, when you are still establishing a supply and running on very little sleep, the pull toward a daily immune packet is strong. Nothing in the lactation data argues against occasional use, but the milk vitamin C ceiling means daily packets add little.
• Established nursing. Once feeding is settled, this becomes a question about your own intake rather than the baby's. The lactation RDA for vitamin C is 120 mg a day, which one packet clears many times over.
• Weaning. With an older baby and mixed feeding, the same logic holds. If you are stacking a multivitamin, a postnatal, and an immune packet, add up the zinc across all three before adding anything else.