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Vitamin K2

Vitamin K2 is safe during breastfeeding. Breast milk is naturally low in vitamin K, so your newborn received a vitamin K injection at birth — mom supplementing doesn't replace that.

Vitamin K2 (menaquinone) supplements are safe during breastfeeding. However, breast milk is naturally low in vitamin K regardless of maternal intake, which is why all newborns receive a vitamin K injection at birth to prevent hemorrhagic disease. Maternal K2 supplementation does not significantly increase breast milk vitamin K levels. K2 from food sources (aged cheese, natto, fermented foods) is naturally present.
Sources: AAP, LactMed

Always confirm with your doctor or lactation consultant before making dietary changes while breastfeeding.

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