Vitamins While Breastfeeding: Needs, Milk Content and Official Advice

What official bodies publish for breastfeeding

Evidence label for the nutrient roles: established nutritional role. The reference intakes below are MedlinePlus's US figures (from the US National Academies) for breastfeeding women aged 19 to 50 unless stated.

Different bodies set different numbers. Do not combine figures from different countries; see RDA, AI, DV and UL. The vitamin A figure refers to preformed vitamin A, not carotenoids. [4]

Vitamin D: mother or baby?

The NHS says a breastfed baby needs its own supplement whether or not the mother takes one. [12] Health Canada's page for pregnancy and breastfeeding advises a 400 IU (10 mcg) vitamin D supplement. [13] Health Canada's infant guidance says the vitamin D in a usual multivitamin is considered unlikely to raise breast milk vitamin D enough for a baby. [14] A US randomized trial of exclusively breastfeeding women found that 6,400 IU a day in mothers (a study amount, not advice) raised the milk's vitamin D enough that infants matched the group whose infants had drops. [15] Evidence label: promising but limited. Details and the baby's own schedule are on vitamin D and K for infants.

What a mother's diet and supplements do to milk vitamins

• B12. A systematic review (11 studies) found B12 highest in early milk and falling over the first 3 to 4 months. It found some link between the mother's habitual B12 intake and milk B12 in marginally nourished women, and that supplements of 50 to 250 mcg a day raised milk B12 while taken. Study amounts, not advice. Current reference values rest on outdated methods in 9 Brazilian women, and the authors call for new ones. [16]
• Vegetarian and vegan diets. A systematic review (13 publications) found milk from non-vegetarian, vegetarian and vegan mothers was of comparable nutritional value, with differences mainly in fatty acids and some micronutrients, mostly B12, and concluded that appropriate supplementation is needed to compensate. [17] MedlinePlus says B12 is not found in plant foods unless fortified. [6] See B12 for vegetarians and vegans and foods high in B12.
• Overall diet. A 2024 narrative review found breastfeeding mothers' diets often fell short on folic acid, B12, A and D, and that some milk nutrients rise with maternal supplements. It also noted the debate on whether supplements are needed continues. [18] Evidence label: mixed.

What this page cannot tell you

The US National Library of Medicine's LactMed drug database blocked our download, and the NIH Office of Dietary Supplements pages were not readable, so neither is cited. Proper evidence not found: trials showing how much milk content of vitamins A, E, K or C rises per supplement amount; sources searched were PubMed, the NHS, MedlinePlus and Health Canada. No claim is made here that any vitamin increases milk supply or "boosts" a baby's immunity.