Water-Soluble Vitamins in Human Milk Factors Affecting Their Concentration and Their Physiological Significance.
Level 5 - mechanism / opinion, no new human data
Narrative review of existing literature without systematic search criteria
PubMed 30865992 · doi:10.1159/000490296
What was done
The author reviewed evidence regarding factors influencing water-soluble vitamin concentrations (B vitamins and vitamin C) in human breast milk, their physiological roles, and how maternal intake and maternal characteristics affect milk composition.
What was found
The abstract provides no quantitative metrics or effect sizes. Directionally, thiamine, niacin, and pantothenic acid concentrations increase across lactation; vitamin B6, vitamin B12, and ascorbic acid gradually decrease; riboflavin remains stable; and choline stabilizes after an initial increase, while folate fluctuates before stabilizing late in lactation. Concentrations are influenced by maternal diet, supplementation, parity, preterm birth, smoking, and maternal illness, with minimal impact from within-feed timing or diurnal variation.
Why it matters
Breast milk vitamin levels inform maternal dietary guidelines and adequate intake recommendations for infants, but clinical deficiency thresholds for breastfed infants remain poorly defined.
Limits
The abstract notes significant methodological shortcomings across existing studies, including generally small sample sizes, uncertain maternal baseline nutritional status, inconsistent milk sampling times postpartum, and a lack of standardized clinical cutoffs for infant risk.
Cited by
- contradicts Human breast milk contains vitamin D and all eight B vitamins derived from the mother's microbiome.